Complex sentence: Hufnagel completed a summer internship with the New Jersey Nets, before attending the University of Oklahoma, where he served as a graduate assistant coach for the men's basketball team and is credited with helping develop Blake Griffin.
Split into simpler sentences: Hufnagel completed a summer internship with the New Jersey Nets. He then attended the University of Oklahoma, where he served as a graduate assistant coach for the Sooners men's basketball team, and was credited with helping develop Blake Griffin.