Complex sentence: On February 19-20,1971, Sir Lord Baltimore played consecutive nights at New York's Fillmore East as the opening act on a bill that included The J. Geils Band and Black Sabbath.
Split into simpler sentences: On February 19-20,1971, Sir Lord Baltimore played consecutive nights at New York's Fillmore East. They were the opening act on a bill that included The J. Geils Band and Black Sabbath.