Complex sentence: Curtis Greer (born November 10,1957 in Detroit, Michigan) is a former professional American football player who was selected by the St. Louis Cardinals in the first round (6th overall) of the 1980 NFL Draft.
Split into simpler sentences: Curtis Greer (born November 10,1957) is a former American football player. He was selected by the St. Louis Cardinals in the first round (sixth overall pick) of the 1980 NFL Draft.