Complex sentence: Simeon is well known in the Chicago area as a high school sports powerhouse, winning the IHSA Class AA state boys' basketball championships three times; 1983--84,2005--06, and 2006--07.
Split into simpler sentences: Simeon is well known in the Chicago area as a high school sports powerhouse. Simeon won the IHSA Class AA state boys' basketball championships three times; 1983--84,2005--06, and 2006--07.