Complex sentence: The men's gymnastics team has won nine national championships, the most out of all sports at the University of Oklahoma; the years they won were 1977,1978,1991,2002,2003,2005,2006,2008, and 2015.
Split into simpler sentences: The men's gymnastics team has won nine national championships, the most out of all sports at the University of Oklahoma. The years they won are 1977,1978,1991,2002,2003,2005,2006,2008, and 2015.