Complex sentence: Audi was the first manufacturer to try to incorporate lightweight building concepts using aluminium and associated alloys into a "mass market" vehicle; the previous efforts at using the Audi Space Frame were limited to the rather more expensive Audi A8.
Split into simpler sentences: Audi was the first manufacturer to try to incorporate lightweight building concepts using aluminium and associated alloys into a "mass market" vehicle. Previous efforts at using the Audi Space Frame were limited to the rather more expensive Audi A8.