Complex sentence: The 660th ACWS initially used an AN/MPS-7 radar and by 1958 MacDill also had AN/GPS-3 and AN/MPS-14 radars.
Split into simpler sentences: The 660th ACWS initially used an AN/MPS-7 radar. By 1958 MacDill also had AN/GPS-3 and AN/MPS-14 radars.