Complex sentence: The initial A340-200 and -300 variants share the fuselage and wing of the twin-engine Airbus A330 with which it was concurrently designed, while the -500 and -600 are longer and have larger wings.
Split into simpler sentences: The initial A340-200 and -300 variants share the fuselage and wing of the twin-engine Airbus A330 with which it was concurrently designed. The A340-500 and -600 are longer and have larger wings.