Complex sentence: Following the Soviet annexation of Lithuania during the war, he and his German-born wife accepted Soviet citizenship and in the early 1950s moved to East Germany reportedly on the recommendation of Soviet officials, becoming "informeller Mitarbeiter".
Split into simpler sentences: Following the Soviet annexation of Lithuania during the war, Segal and wife accepted Soviet citizenship. In the early 1950s, he moved to East Germany, reportedly on the recommendation of Soviet officials, becoming "informeller Mitarbeiter".