Complex sentence: Bango has been the Bucks'official mascot since on October 18,1977, which was Milwaukee's home opener of the 1977--78 NBA season.
Split into simpler sentences: Bango has been the Bucks'official mascot for over 37 years. He made his official debut on October 18,1977, which was Milwaukee's home opener of the 1977--78 NBA season.