Complex sentence: The delivery of the initial batch of FICs which was to have taken place in December 2012 and the following batch in April 2013 year, have been delayed at the manufacturer's end, this has pushed the delivery schedule by a few months.
Split into simpler sentences: The delivery of the initial batch of FICs was scheduled for December 2012 and the following batch in April 2013. This has been delayed at the manufacturer's end, pushing the delivery schedule by a few months.