Complex sentence: Saving Aimee completed a national UK headline tour in June 2009, with most of the shows selling out in advance, and the now have a 2nd string of dates as a 2nd part to their headline tour in July 2009.
Split into simpler sentences: Saving Aimee completed a national UK headline tour in June 2009, with most of the shows selling out in advance. With a 2nd string of dates as a 2nd part to their headline tour in July 2009.