Complex sentence: The East-West Shrine Game showcased Frazier's skill set for the many NFL scouts in attendance, but before the NFL Scouting Combine, he experienced more problems with blood clots.
Split into simpler sentences: The East-West Shrine Game showcased Frazier's skill set for the many NFL scouts that were in attendance. Unfortunately, leading up to the NFL Scouting Combine, Frazier started experiencing more problems with blood clots.