Complex sentence: The band reunited once again for free concerts on July 17 and October 21,2011, dedicated to the victims of the Tōhoku earthquake and tsunami and performed a short tour at the end of 2013.
Split into simpler sentences: The band reunited once again for free concerts on July 17 and October 21,2011, dedicated to the victims of the Tōhoku earthquake and tsunami. They are scheduled to perform a short tour at the end of 2013.