Complex sentence: The campus and classroom scenes were shot at Hoover High School in Glendale, California; most of that school's buildings were later torn down and replaced with a more contemporary look in the mid- 1960s to comply with California's building codes for schools.
Split into simpler sentences: The campus and classroom scenes were shot at Hoover High School, Glendale, CA. Most of the buildings were later torn down and replaced with a more contemporary look in the mid- 1960s to comply with California's building codes for schools.