Complex sentence: The original campus was originally located on the same property as Napa High School and was later moved to its current location in 1965 when a campus was established on surplus state property which originally was part of land belonging to Napa State Hospital.
Split into simpler sentences: The original campus was located on the same property as Napa High School. The College was later moved to its current location in 1965 when a campus was established on surplus state property which originally was part of land belonging to Napa State Hospital.