Complex sentence: Soon after the Nazis came to power, Zwiebel and his family left Germany; while he and his siblings were raised as Lutherans by their mother, his father was Jewish as well as politically active against the Nazis.
Split into simpler sentences: Soon after the Nazis came to power, Zwiebel and his family had to leave Germany. He and his siblings were raised as Lutherans by their mother, but his father was Jewish as well as politically active against the Nazis.