Complex sentence: In 1957, Genovese eventually organized a murder attempt on Costello, who was shot in the head, but survived and decided to retire from La Cosa Nostra that same year.
Split into simpler sentences: In 1957, Genovese eventually organized a murder-attempt on Costello. Costello was shot in the head, but survived and decided to retire from La Cosa Nostra that same year.