Complex sentence: The radiators were housed in a new radiator-duct designed by Fredrick Meredith of the RAE at Farnborough; this used the cooling air to generate thrust, greatly reducing the net drag produced by the radiators.
Split into simpler sentences: The radiators were housed in a new radiator-duct designed by Fredrick Meredith of the RAE at Farnborough. This used the cooling air to generate thrust, greatly reducing the net drag produced by the radiators.