Complex sentence: Due to stockpiling of 2005 model Vectras for the Australasian market, there was enough supply of the car for deliveries to last through to 2007, as a result facelifted Vectra Cs were not sold in those markets.
Split into simpler sentences: Due to stockpiling of 2005 model Vectras for the Australasian market, there was enough supply of the car for deliveries to last through to 2007. As a result facelifted Vectra Cs were not sold in those markets.