Complex sentence: The North Cobb Concert Bands have performed all over the state, including the GMEA conference in Savannah in 2006 and 2012,they also attended JanFest at the University of Georgia in 2009.
Split into simpler sentences: The North Cobb Concert Bands have performed all over the state, including the GMEA conference in Savannah in 2006 and 2012. They also attended JanFest at the University of Georgia in 2009.