Complex sentence: His wife was arrested on August 15 and her children taken away under Nazi policy of "Sippenhaft" (shared family guilt); however, early in October she was released again and survived the war.
Split into simpler sentences: His wife was arrested on August 15 and her children taken away under Nazi policy of Sippenhaft. She was accused of shared family guilt, but early in October she was released again and survived the war.