Complex sentence: At the end of the 1950s, Profaci received the first challenge to his authority from capo Joe Gallo and his brothers Larry and Albert, perhaps with encouragement from Gambino crime family boss Carlo Gambino, Profaci's main rival on the Mafia Commission.
Split into simpler sentences: At the end of the 1950s, Profaci received the first challenge of his authority. It came from capo Joe Gallo and his brothers Larry and Albert, perhaps with encouragement from Gambino crime family boss Carlo Gambino, Profaci's main rival on the Mafia Commission.