Complex sentence: Cumberland, Maryland's first broadcast station was granted the call letters WTBO and authorized by the Federal Radio Commission in October 1928 to operate on 1420 kilocycles with a power of 50 watts.
Split into simpler sentences: Cumberland, Maryland's first broadcast station was authorized to operate and granted call letters WTBO in October 1928 by the Federal Radio Commission. Granted was operation on 1420 kilocycles with a power of 50 watts.