Complex sentence: After the fall of Yugoslavia, the Serbian people were punished with genocide by the pro-German Croatian Ustaše and, following the war, with the advent of the Socialist Federal Republic of Yugoslavia which actively persecuted both the Serbian national and religious identity for decades.
Split into simpler sentences: After the fall of Yugoslavia, the Serbian people were punished with genocide by the pro-German Croatian Ustaše. Following the war, with the advent of the Socialist Federal Republic of Yugoslavia actively persecuted both the Serbian national and religious identity for decades.