Complex sentence: The school opened in 1954, as a 7--12 building, when it was located at 82nd and Lakeview Drive, and relocated to its current address on 8969 Park Drive in 1969.
Split into simpler sentences: The school opened in 1954, as a building for grades 7--12, located at 82nd and Lakeview Drive. It relocated to its current address on 8969 Park Drive in 1969.