Complex sentence: Nicholas James Bollettieri (born July 31,1931), is an American tennis coach, born to Italian parents, who is credited with developing many leading players, including Andre Agassi, Jim Courier, Monica Seles, and Mary Pierce.
Split into simpler sentences: Nicholas James Bollettieri (born July 31,1931), is an American tennis coach. He has participated in the development of many leading players, including Andre Agassi, Jim Courier, Monica Seles, and Mary Pierce.