summarise article 12 romeo statute of the international criminal court in longer and simpler version

Article 12 of the Rome Statute of the International Criminal Court states that the Court can exercise jurisdiction over crimes that took place on the territory of a state that is a party to the statute, or by a national of a state that is a party to the statute. This means that the ICC can investigate and prosecute individuals for serious crimes such as genocide, war crimes, and crimes against humanity if they occurred in a country that has signed on to the statute, or if the person accused is a citizen of a country that has signed on.