Complex sentence: David Papaleo (born January 21,1970) is a competitive bodybuilder and fitness model, and personal trainer who is mostly known as pornographic actor named Tom Katt who gained fame as an American male pornographic actor.
Split into simpler sentences: David Papaleo (born January 21,1970) is a competitive bodybuilder and fitness model, and personal trainer. As "Tom Katt" he gained fame as an American male pornographic actor.