Complex sentence: As part of the transition, all the MD80s in Copenhagen will be replaced by leased Airbus A320 and be completed by the end of 2014 which in turn will be replaced as from 2016 by the now 30 ordered Airbus A320neo.
Split into simpler sentences: As part of the transition, all the MD80s in Copenhagen will be replaced by leased Airbus A320 and be completed by the end of 2014. The leased A320's, in turn will be replaced from 2016 by the now 30 ordered Airbus A320neo.