Complex sentence: The Okaw Valley Conference was formed in the early 1950s,it originally consisted of Arcola, Arthur, Atwood-Hammond, Bement, Cerro Gordo, Monticello, Newman, Oakland, Sullivan, Tuscola and Villa Grove.
Split into simpler sentences: The Okaw Valley Conference was formed in the early 1950s. It originally consisted of Arcola, Arthur, Atwood-Hammond, Bement, Cerro Gordo, Monticello, Newman, Oakland, Sullivan, Tuscola, and Villa Grove.