Complex sentence: Until 2015, only Audi and Porsche were using the MLB platform while in February 2016 Volkswagen introduced the Phideon luxury sedan built and sold uniquely in the Chinese market.
Split into simpler sentences: Until 2015, only Audi and Porsche were using the MLB platform. In February 2016 Volkswagen introduced the MLB based Phideon luxury sedan built and sold uniquely in the Chinese market.