Complex sentence: In a flashback earlier in the movie Jonathan remembers that his mother was ordered away by a senior religious leader who took her as is his wife; she returned to get her children, for which she was executed in full view of Jonathan and his father.
Split into simpler sentences: In a flashback earlier in the movie Jonathan remembers that his mother was ordered away by a senior religious leader who took her as is his wife. She returned to get her children, for which she was executed in full view of Jonathan and his father.