Complex sentence: The border between the two Bosnian entities, Federation of Bosnia and Herzegovina and Republika Srpska, runs through the village Jezera, and the Orthodox Christian Kusići population left the area, which is now partially in the Federation of Bosnia and Herzegovina.
Split into simpler sentences: The border between the two Bosnian "entities," i.e. the Federation of Bosnia and Herzegovina and Republika Srpska, runs through the village Jezera. Jezera's Orthodox Christian Kusići population left their homes; the area's borders have been redrawn and the village is now partially in the Federation of Bosnia and Herzegovina.