Complex sentence: Maryville was accepted into the Great Lakes Valley Conference (GLVC) for the 2009-2010 school year when the school began transitioning to NCAA Division II athletics and became an active member of Division II in July 2011.
Split into simpler sentences: Maryville was accepted into the Great Lakes Valley Conference (GLVC) for the 2009-2010 school year, when the school began the transition to NCAA Division II athletics. Maryville became an active member of Division II in July 2011.