Complex sentence: The following week, Saliers attended a performance by The Shadowboxers and one year later, the band went on tour with the Indigo Girls, serving as their backing band and opening act for over two years.
Split into simpler sentences: The following week, Saliers attended a performance by the band. One year later, the band went on tour with the Indigo Girls, serving as their backing band and opening act for over two years.