Complex sentence: Today's location of OHS opened in 1961, and underwent a full renovation, completed in the summer of 2000 that enclosed the 9 separate buildings of the 1961 design.
Split into simpler sentences: Today's location of OHS opened in 1961. Olympia High remained open in its 1961, a full renovation was completed in the summer of 2000, enclosing the 9 separate buildings of the 1961 design.