Complex sentence: Seneca White Deer, a non-profit group, received clearance to run limited bus tours in 2006,2009 and 2012, that "turned out to be hugely successful".
Split into simpler sentences: Seneca White Deer, a non-profit group, received clearance to run limited bus tours in 2006,2009, and 2012. These tours "turned out to be hugely successful".