Complex sentence: His mother, Khang Thi Tran (born 1935), did not immediately flee South Vietnam, staying with five of Cao's siblings and allowed to visit her husband only five times during the seven years he was imprisoned in a Communist "re-education camp".
Split into simpler sentences: His mother, Khang Thi Tran (born 1935), did not immediately flee South Vietnam. She stayed with five of Cao's siblings and was allowed to visit her husband only five times during the seven years he was imprisoned in a Communist "re-education camp".