Complex sentence: Unusually for Fender, the Harvard had no predecessor and, although the Harvard name was revived later by Fender, no descendants, but filled a gap between the student Champ and Princeton models and the professional Deluxe.
Split into simpler sentences: Unusually for Fender, the Harvard had no predecessor and, although the Harvard name was revived later by Fender, no descendants. The Harvard filled a gap between the student Champ and Princeton models and the professional Deluxe.