Complex sentence: Clifton Marcel Crosby (born September 17,1974 in Erie, Pennsylvania) is a former professional American football player who played defensive back for four seasons for the St. Louis Rams and the Indianapolis Colts in the National Football League.
Split into simpler sentences: Clifton Marcel Crosby (born September 17,1974 in Erie, Pennsylvania) is a former professional American football player who played defensive back. Clifton played four seasons for the St. Louis Rams and the Indianapolis Colts in the National Football League.