Complex sentence: O'Neil Bell (December 29,1974--November 25,2015) was a Jamaican professional boxer who held the unified WBA, WBC, IBF and "The Ring" magazine cruiserweight titles.
Split into simpler sentences: O'Neil Bell (December 29,1974--November 25,2015) was a Jamaican professional boxer. He held the unified WBA, WBC, IBF and "The Ring" magazine cruiserweight titles.