Complex sentence: Professional and college-level sports teams in North America have enacted anti-fraternization policies between athletes and cheerleaders; only one professional team, the Oakland Raiders of the NFL, allows permitted casual contacts between player and cheerleader.
Split into simpler sentences: Professional and college-level sports teams in North America have enacted anti-fraternization policies between athletes and cheerleaders. Only one professional team, the Oakland Raiders of the NFL, allows casual contacts between player and cheerleader.