Complex sentence: Terlezki was born in Oleshiv, a village near the town of Tlumach in what is now western Ukraine but was then part of Poland and survived persecution by both Nazi Germany and the Soviet Union, which made him a powerful voice against totalitarian governments.
Split into simpler sentences: Terlezki was born in Oleshiv, a village near the town of Tlumach in what is now western Ukraine but was then part of Poland. Terlezki experienced life in both Nazi Germany, and the Soviet Union, which made him a powerful voice against totalitarian governments.