sentences:  The MSL and "Des Plaines Valley" League both broke off from an interim suburban league that dated back several decades.The original members of the MSL were Deerfield High School, Forest View High School, Glenbrook North High School, Glenbrook South High School, Maine West High School, and Prospect High School.Not even a year old, the conference announced expansion for the 1965–66 season with, Wheeling High School, Niles North High School, and New Trier West High School joining as the schools opened.