Complex sentence: Its athletic program, known as the Wildcats, was a charter member of the Fort Ancient Valley Conference from 1964 until 1992, when the school left for the Southern Buckeye Athletic/Academic Conference National Division.
Split into simpler sentences: Its athletic program, known as the Wildcats, was a charter member of the Fort Ancient Valley Conference from 1964 until 1992. The school is know part of the Southern Buckeye Athletic/Academic Conference National Division.