Complex sentence: Dominick "The Gap" Petrilli (d.1953) was a New York mobster associated with mobster and later government informant Joe Valachi, later sponsoring him for induction into the Lucchese crime family (although other sources claim the Genovese crime family).
Split into simpler sentences: Dominick "The Gap" Petrilli (d.1953) was a New York mobster associated with mobster and later government informant Joe Valachi. Petrilli reportedly sponsored Valachi for membership in the Lucchese crime family (although other sources claim the Genovese crime family).