Complex sentence: The Pipers were one of the ABA's inaugural franchises in 1967, and won the league's first championship with their star player, ABA MVP (and future Hall-of-Famer) Connie Hawkins; it remains Pittsburgh's only pro basketball championship.
Split into simpler sentences: The Pipers were one of the ABA's inaugural franchises in 1967. The team had great success on the court, winning the league's first ABA Championship, led by their star player, ABA MVP (and future Hall-of-Famer) Connie Hawkins; it remains Pittsburgh's only pro basketball championship.