Complex sentence: Channels 70 through 83 were removed from the bandplan in the 1970s to make way for AMPS cellular telephone service; these channels were mainly used in the U.S., and mainly for translators, some of which continued in operation if their frequencies were not used by cellular.
Split into simpler sentences: Channels 70 through 83 were removed from the bandplan in the 1970s to make way for AMPS cellular telephone service. These channels were mainly used in the U.S., and mainly for translators, some of which continued in operation if their frequencies were not used by cellular.