Simplify the following text for a Grade 11 native English-speaking person.
Original: Instead , as Soviet and Allied forces gradually pushed back the German lines , most of the Jews of German-occupied Europe were sent to extermination or concentration camps , or killed where they lived .
Simplified: Instead , as the Soviet army gradually pushed back the German lines , most of the Jews of German-occupied Europe were sent to concentration or death camps , or killed where they lived .