Complex sentence: Scud FM was the nickname for the BBC radio rolling news service that was on air during the first Gulf War from 16 January until 2 March 1991 using the BBC Radio 4 FM frequencies, whist the regular scheduled service continued on long wave.
Split into simpler sentences: Scud FM was the nickname for the BBC radio rolling news service that was on air during the first Gulf War from 16 January until 2 March 1991. It used BBC Radio 4's FM frequencies, whist their regular scheduled service continued on long wave.