Complex sentence: The sets were converted from conventional loco-hauled coaching stock in 1983-1984, and were used in combination with Class 73 electro-diesel locomotives and Class 489 luggage vans.
Split into simpler sentences: The sets were converted from conventional loco-hauled coaching stock in 1983-1984. They worked in multiple with Class 73 electro-diesel locomotives and Class 489 luggage vans.