Complex sentence: SAO Eastern Slavonia, Baranja and Western Syrmia was ethnically cleansed of its non-Serb population and became part of the self-declared Republic of Serbian Krajina, which committed numerous war crimes against Croats, Hungarians, Ruthenians and other non-Serbs.
Split into simpler sentences: SAO Eastern Slavonia, Baranja and Western Syrmia was ethnically cleansed of its non-Serb population and became part of the self-declared Republic of Serbian Krajina. Committed numerous war crimes against Croats, Hungarians, Ruthenians and other non-Serbs.