Complex sentence: Pistone said that Napolitano wasn't a 24-hour gangster, meaning that you could talk to him about other things besides the mafia, unlike other mobsters who only wanted to talk about illegal activities and mafia business.
Split into simpler sentences: Pistone said that Napolitano was not a 24-hour gangster, meaning that you could talk to him about other things besides the mafia. Unlike other mobsters who only wanted to talk about illegal activities and mafia business.