Complex sentence: Fullington has been an eight-time world heavyweight champion, having held the ECW World Heavyweight Championship 5 times, the XPW World Heavyweight Championship once, the IWC World Heavyweight Championship once, and the UWF Universal Heavyweight Championship once.
Split into simpler sentences: Fullington has been an five-time world heavyweight champion, having held the ECW World Heavyweight Championship 5 times. He has also held the XPW World Heavyweight Championship once, the IWC World Heavyweight Championship once, and the UWF Universal Heavyweight Championship once.