This is only part of the whole passage. What is the best way to simplify the horrific event because all this info is great to to include in my Summary but I don't want to include it all.

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In the Republic of Bosnia-Herzegovina, conflict between the three main ethnic groups, the Serbs, Croats, and Muslims (Bosniaks), resulted in genocide committed by the Serbs against the Muslims in Bosnia.
Yugoslavia was composed of ethnic and religious groups that had been historical rivals, even bitter enemies, including the Serbs (Orthodox Christians), Croats (Catholics) and ethnic Albanians (Muslims).
During World War II, Yugoslavia was invaded by Nazi Germany and was partitioned. A fierce resistance movement sprang up led by Josip Tito. Following Germany's defeat, Tito reunified Yugoslavia under the slogan "Brotherhood and Unity," merging together Slovenia, Croatia, Bosnia, Serbia, Montenegro, Macedonia, along with two self-governing provinces, Kosovo and Vojvodina.
After his death in 1980 and without his strong leadership, Yugoslavia quickly plunged into political and economic chaos.
A new leader arose by the late 1980s, a Serbian named Slobodan Milosevic, a former Communist who had turned to nationalism and religious hatred to gain power. He began by inflaming long-standing tensions between Serbs and Muslims in the independent provence of Kosovo. Orthodox Christian Serbs in Kosovo were in the minority and claimed they were being mistreated by the Albanian Muslim majority. Serbian-backed political unrest in Kosovo eventually led to its loss of independence and domination by Milosevic.
The U.S. under President George Bush chose not to get involved militarily, but instead recognized the independence of both Slovenia and Croatia.
By the end of 1991, a U.S.-sponsored cease-fire agreement was brokered between the Serbs and Croats fighting in Croatia.
In April 1992, the U.S. and European Community chose to recognize the independence of Bosnia, a mostly Muslim country where the Serb minority made up 32 percent of the population. Milosevic responded to Bosnia's declaration of independence by attacking Sarajevo, its capital city, best known for hosting the 1984 Winter Olympics.
As the Serbs gained ground, they began to systematically roundup local Muslims in scenes eerily similar to those that had occurred under the Nazis during World War II, including mass shootings, forced repopulation of entire towns, and confinement in make-shift concentration camps for men and boys. The Serbs also terrorized Muslim families into fleeing their villages by using as a weapon against women and girls.
The actions of the Serbs were labeled as 'ethnic cleansing,' a name which quickly took hold among the international media.
Despite media reports of the secret camps, the mass killings, as well as the destruction of Muslim mosques and historic architecture in Bosnia, the world community remained mostly indifferent. Serbs in Bosnia freely committed genocide against Muslims.
The U.S. under its new President, Bill Clinton, who had promised during his election campaign in 1992 to stop the ethnic cleansing in Bosnia, now issued an ultimatum through the North Atlantic Treaty Organization (NATO) demanding that the Serbs withdraw their artillery from Sarajevo. The Serbs quickly complied and a NATO-imposed cease-fire in Sarajevo was declared.
The U.S. then launched diplomatic efforts aimed at unifying Bosnian Muslims and the Croats against the Serbs. However, this new Muslim-Croat alliance failed to stop the Serbs from attacking Muslim towns in Bosnia which had been declared Safe Havens by the U.N. A total of six Muslim towns had been established as Safe Havens in May 1993 under the supervision of U.N. peacekeepers. The worst mass murder in Europe since World War II. In addition, the Serbs continued to engage in mass of Muslim females.
Serb forces also lost ground to Bosnian Muslims who had received arms shipments from the Islamic world. As a result, half of Bosnia was eventually retaken by Muslim-Croat troops.
By now, over 200,000 Muslim civilians had been systematically murdered. More than 20,000 were missing and feared dead, while 2,000,000 had become refugees.

Take notes on this selection.

Start with the entire first sentence. Then note the details that tell about the genocide.

To simplify the horrific event described in the passage, focus on the key points and omit unnecessary details. Here is a suggested summary:

"In the Republic of Bosnia-Herzegovina, conflict between three main ethnic groups, the Serbs, Croats, and Muslims, resulted in genocide committed by the Serbs against the Muslims. This conflict stemmed from historical rivalries and the rise of Serbian leader Slobodan Milosevic, who fueled tensions between Serbs and Muslims. The Serbs carried out ethnic cleansing, including mass killings, forced displacement, and as a weapon against women and girls. Despite media reports and international indifference, the United States, under President Bill Clinton, issued ultimatums and launched diplomatic efforts to address the crisis. Eventually, Bosnian Muslims and Croats, with support from the Islamic world, were able to regain control of half of Bosnia. The horrific event resulted in the systematic murder of over 200,000 Muslim civilians, with many more missing and displaced."

Remember to review the suggested summary and make any necessary adjustments to match the tone and focus of your specific summary.