Complex sentence: Twelve of the 16 head coaches spent their entire professional coaching careers with the franchise, including John McNally, Bert Bell, and Chuck Noll, who have also been voted into the Pro Football Hall of Fame.
Split into simpler sentences: Twelve of the 16 head coaches spent their entire professional coaching careers with the franchise. Including John McNally, Bert Bell, and Chuck Noll, who have also been voted into the Pro Football Hall of Fame.