Complex sentence: There were originally also 27 orders for the freighter version, the A380F, but when this program was "frozen" following production delays, 20 A380F orders were cancelled and the remaining 7 were converted to A380-800s.
Split into simpler sentences: There were originally 27 orders for the freighter version, the A380F, but this program was "frozen" following production delays. Of these 27 A380F orders, 20 were cancelled and 7 were converted to A380-800s.