Complex sentence: Gresham Middle School was established in the fall of 1971 in a building that had previously housed Central High School, which was re-constructed on Jacksboro Pike about two miles from Gresham's current location.
Split into simpler sentences: Gresham Middle School was established in the fall of 1971. Until 1971, Gresham's current building was Central High School, which was re-constructed on Jacksboro Pike about two miles from Gresham's current location.