Complex sentence: Opel Special Vehicles GmbH (OSV) is a subsidiary of Adam Opel AG with expertise in special vehicle lines and modifications based in Rüsselsheim, Germany, and is also responsible for all Opel/Vauxhall LPG variants.
Split into simpler sentences: Opel Special Vehicles GmbH (OSV) is a subsidiary of Adam Opel AG which produces special series and undertakes vehicle modifications. OSV is also responsible for all Opel/Vauxhall LPG variants.