Simplify the following text for a Grade 11 native English-speaking person.
Original: As German forces withdrew from Yugoslavia in 1945 , the UstaÅ e mostly left the country , part of them remained in SFR Yugoslavia as resistance group known as Crusaders and large number of them was killed without trial by Yugoslav forces ( the Partisans ) after the end of war .
Simplified: As German forces withdrew from Yugoslavia in 1945 , the UstaÅ e were defeated and expelled by the Yugoslav Partisans .