Complex sentence: The station initially wanted to use calls CKNN for its new format and frequency but was denied permission after they illegally used these call letters during testing on 940 kHz in the weeks preceding the frequency change.
Split into simpler sentences: The station initially wanted to use the call letters CKNN for its new format and frequency. It was denied permission after they illegally used these call letters during testing on 940 kHz in the weeks preceding the frequency change.