Complex sentence: Acting quickly, Frady writes a bomb threat in a lavatory mirror with a bar of soap for the stewardess to find, warning that there is a bomb on the plane, but removes it after finding another passenger is waiting outside the lavatory door.
Split into simpler sentences: Acting quickly, Frady writes a bomb threat in a lavatory mirror with a bar of soap for the stewardess to find, warning that there is a bomb on the plane. But he removes it after finding another passenger is waiting outside the lavatory door.