Complex sentence: Fat Tony is a gangster and the underboss of the Springfield Mafia and his henchmen include Legs, Louie and Johnny Tightlips, and he answers to Don Vittorio DiMaggio.
Split into simpler sentences: Fat Tony is a gangster and the underboss of the Springfield Mafia. His henchmen include Legs, Louie and Johnny Tightlips, and he answers to Don Vittorio DiMaggio.