Complex sentence: Lackawanna Senior High School was nationally famous in the 1960s because of race riots and in the 1960s and early 70s because of its dominant football teams (quarterbacked by Ron Jaworski for some of those years).
Split into simpler sentences: Lackawanna Senior High School was nationally famous in the 1960s because of race riots. It was also famous in the 1960s and early 70s because of its dominant football teams (quarterbacked by Ron Jaworski for some of those years).