Complex sentence: The first of Dozier's football players to reach the National Football League was Kevin Brooks, who graduated from Mackenzie in 1981; prior to his professional career, Brooks played collegiately for the University of Michigan.
Split into simpler sentences: The first of Dozier's football players to reach the National Football League was Kevin Brooks, who graduated from Mackenzie in 1981. Prior to his professional career, Brooks played collegiately for the University of Michigan.