Complex sentence: The Volkswagen California is based on the T5 Multivan by Volkswagen Commercial Vehicles it is the first campervan designed and built in-house by VWCV Special Business Unit a subsidiary of Volkswagen Commercial Vehicles.
Split into simpler sentences: The Volkswagen California is based on the T5 Multivan by Volkswagen Commercial Vehicles (VWCV). It is the first campervan designed and built in-house by VWCV Special Business Unit, a subsidiary of Volkswagen Commercial Vehicles.