Complex sentence: Despite the collapse of the AirAsia joint venture, VietJet announced in November that its launch plans would proceed, with the first flight operated on December 25,2011, flying from Ho Chi Minh City to Hanoi.
Split into simpler sentences: Despite the collapse of the AirAsia joint venture, VietJet announced in November that its launch plans would proceed. The airline's maiden flight was eventually launched on December 25,2011, flying from Ho Chi Minh City to Hanoi.