Complex sentence: William Henry Grigsby (born March 19,1970) is an American former professional boxer who competed from 1998 to 2007 and held the IBF junior flyweight title twice between 1998 and 2006.
Split into simpler sentences: William Henry Grigsby (born March 19,1970) is an American former professional boxer. He competed from 1998 to 2007 and held the IBF junior flyweight title twice between 1998 and 2006.