Complex sentence: Since 1980, he has served as the head men's basketball coach at Duke University, where he has led the Blue Devils to five NCAA Championships, 12 Final Fours, 12 ACC regular season titles, and 14 ACC Tournament championships.
Split into simpler sentences: Since 1980, he has served as the head men's basketball coach at Duke University. At Duke, Krzyzewski has led the Blue Devils to five NCAA Championships, 12 Final Fours, 12 ACC regular season titles, and 14 ACC Tournament championships.