Complex sentence: It served with the Royal Air Force as a single-seat fighter-bomber and two-seat night-fighter, a navalised version-the Sea Venom-serving with the Fleet Air Arm (FAA) of the Royal Navy (RN).
Split into simpler sentences: It served with the Royal Air Force as a single-seat fighter-bomber and two-seat night fighter. A navalised version, the Sea Venom, served with the Fleet Air Arm (FAA) of the Royal Navy (RN).