Complex sentence: Baseball-Participating in the MAIS, the Rebels have won 12 state championships since the school's opening in 1971, including the years 1997,1998,1999,2000,2005,2006,2007,2008, and 2013.
Split into simpler sentences: Baseball-Participating in the MAIS, the Rebels have a total of 12 state championships since the school's opening in 1971. The Rebels won state championships in the years 1997,1998,1999,2000,2005,2006,2007,2008, and 2013.