Complex sentence: Fahrenheit met her doom when the StormWatch super-satellite was boarded by hundreds of xenomorphs as it attempted to destroy an incoming celestial body before it would collide with the Earth.
Split into simpler sentences: Fahrenheit met her doom when the StormWatch super-satellite was boarded by hundreds of xenomorphs. This was while Stormwatch is attempting to destroy an incoming celestial body before it would collide with the Earth.