Complex sentence: The first aircraft (serial number 101) was rolled out on 21 December 2007 with plans for a maiden flight in March 2008; however this was first delayed to 21 September 2008 and finally took place on 28 November 2008 at Shanghai's Dachang Airfield.
Split into simpler sentences: The first aircraft (serial number 101) was rolled out on 21 December 2007 with plans for a maiden flight in March 2008. This was first delayed to 21 September 2008 and finally took place on 28 November 2008 at Shanghai's Dachang Airfield.