Complex sentence: Footage is shown of 1990's-era roller derby, along with footage of the band playing to include lead singer Vinnie Dombroski promoting Wax Ecstatic as being the answer to all of her problems.
Split into simpler sentences: Footage is shown of 1990's-era roller derby, along with footage of the band playing. To include lead singer Vinnie Dombroski promoting Wax Ecstatic as being the answer to all of her problems.