Complex sentence: The church held a Walpurgisnacht Show in April 2005 at the 12 Galaxies nightclub in San Francisco, as well as a pre-Halloween benefit show in October 2005 at Edinburgh Castle (also in San Francisco) to help the victims of Hurricanes Katrina and Rita.
Split into simpler sentences: The church held a "Walpurgisnacht" Show in April 2005 at The 12 Galaxies nightclub in San Francisco. They had a Pre-Halloween Benefit show in October 2005 at Edinburgh Castle in San Francisco to help victims of Hurricanes Katrina and Rita.