Complex sentence: Kelly Robert Pavlik (born April 5,1982) is an American former professional boxer who held the WBC, WBO, "The Ring" magazine and lineal middleweight titles from 2007 to 2010.
Split into simpler sentences: Kelly Robert Pavlik (born April 5,1982) is an American former professional boxer. He held the WBC, WBO and "The Ring" magazine middleweight titles from 2007 to 2010.