Complex sentence: The next stage of development was to introduce the helicopter, which was used for carrying deer back to awaiting trucks positioned at remote road ends, to be couriered to the venison processing factories.
Split into simpler sentences: The next stage of development was to introduce the helicopter, which was used for carrying deer back to awaiting trucks, to be couriered to the meat works. The trucks were positioned at remote road ends to freight the deer, to the venison processing factories.