Complex sentence: The flight carried the "Raffaello" Multi-Purpose Logistics Module, built by the Italian Space Agency, as well as the External Stowage Platform-2, which was mounted to the port side of the Quest Airlock.
Split into simpler sentences: The flight carried the "Raffaello" Multi-Purpose Logistics Module, built by the Italian Space Agency. Also the External Stowage Platform-2, mounting that to the port side of the Quest Airlock.