Complex sentence: In 1970, a performance by the late-arriving Sly & the Family Stone nearly resulted in a riot, and in 1973 a performance by Humble Pie & the Blackberries "did" result in a riot, along with a bonfire and about 300 arrests.
Split into simpler sentences: In 1970, a performance by the late-arriving Sly & the Family Stone nearly resulted in a riot. In 1973, a performance by Humble Pie & the Blackberries resulted in a riot, a bonfire, and about 300 arrests.