Complex sentence: He served 13 years (1986-1999) as head coach of the University of Minnesota's men's basketball team, but was forced to resign due to one of the worst academic fraud scandals in the history of NCAA sports.
Split into simpler sentences: He served 13 years (1986-1999) as head coach of the University of Minnesota's men's basketball team. He was fired from coaching at Minnesota due to one of the worst academic fraud scandals in the history of NCAA sports.