Complex sentence: Skymark planned to introduce a frequent flyer program in January 2014 to coincide with the launch of its premium domestic service, but delayed this as of December 2013 in order to focus on preparing for international service in December 2014.
Split into simpler sentences: Skymark planned to introduce a frequent flyer program in January 2014 to coincide with the launch of its premium domestic service. They delayed as of December 2013 to focus on preparing for international service in December 2014.