Complex sentence: Vauxhall's Astra entered the market with the 1984 MK2 model, as well as the Belmont saloon that was launched in 1986.
Split into simpler sentences: Vauxhall's Astra entered the market with the 1984 MK2 model. It was available with several versions, as well as the Belmont saloon that was launched in 1986.