Complex sentence: Following the Castelammarse War, Carfano became a lieutenant to Adonis and Costello and, after Luciano's imprisonment in 1936, Carfano was named as Underboss as Costello assumed leadership of the New York crime family.
Split into simpler sentences: Following the Castelammarse War, Carfano became a lieutenant to Adonis and Costello. After Luciano's imprisonment in 1936, Carfano became Underboss as Costello assumed leadership of the New York crime family.