Complex sentence: In October 1966 an eight-gate Main Terminal Building was opened on the northeast side of the airport; in 1974 Delta Air Lines moved into its own six-gate terminal with the airport's first jetways.
Split into simpler sentences: In October 1966, a jet-age eight-gate Main Terminal Building was opened on the northeast quadrant of the airport. In 1974, Delta Air Lines moved into its own six-gate unit terminal which featured the airport's first jetways.