Complex sentence: They were active at house parties, and is known for their participation in community events such as the "Black History Parades" which was held back then in Downtown Bakersfield starting on 19th & Chester Avenue and ended at Truxton Avenue & L street.
Split into simpler sentences: They were active at house parties, and participated in community events such as the "Black History Parade" which was held in Downtown Bakersfield. The starting point was at 19th & Chester Avenue, and ended at Truxton Avenue & L street.