(rephrase in 4 sentences like a 7th grader) The Holocaust was a terrible event during World War II where millions of people, including Jews, Romani people, Poles, and others, were killed by the Nazis. They used methods like mass shootings, forced labor, and concentration camps to carry out these atrocities.

The Holocaust was a really awful time in World War II when the Nazis killed lots of people like Jews, Romani people, and Poles. They had these big places called concentration camps where they made people work super hard and treated them really badly. They also did lots of mass shootings where they lined people up and shot them just because of who they were. It's one of the saddest and worst things that happened in history.