Complex sentence: He is best known for his appearances with World Championship Wrestling (WCW) and World Wrestling Entertainment (WWE) as Hugh Morrus and Bill DeMott respectively and as Crash the Terminator in Extreme Championship Wrestling (ECW) and Japan.
Split into simpler sentences: He is best known for his appearances with World Championship Wrestling (WCW) and World Wrestling Entertainment (WWE) as Hugh Morrus and Bill DeMott, respectively. He also performed as Crash the Terminator in both Extreme Championship Wrestling (ECW) and Japan.