Complex sentence: A new WHIM-FM emerged on 94.1 MHz in 1966 when WHIM began broadcasting the format it would keep in one form or another for 31 years: country music.
Split into simpler sentences: A new WHIM-FM emerged on 94.1 MHz in 1966. In 1966, WHIM began broadcasting the format it would keep in one form or another for 31 years: country music.