Complex sentence: The Vectra received a facelift near the end of 2005, retaining a similar line of engines, however the 3.0 diesel received a power increase to and the petrol V6 engine was replaced by an Australian-built turbocharged 2.8 litre "High Feature" V6 unit.
Split into simpler sentences: The Vectra received a facelift at the end of 2005, retaining a similar line of engines. However, the power of the 3.0 diesel was increased to and the petrol V6 engine was replaced by an Australian-built turbocharged 2.8 litre "High Feature" V6 unit.