Complex sentence: He is famous for his run as one of the great super-heavyweights, and later as the voice of the World Wrestling Federation as commentator and as backstage manager during the 1980s and 1990s, and added on-screen President to his duties in the latter decade.
Split into simpler sentences: He is famous for his run as an in-ring performer, and later as the voice of the World Wrestling Federation as commentator and as backstage manager during the 1980s and 1990s. He added on-screen President to his duties in the latter decade.