Complex sentence: The Balliol was designed to replace the North American Harvard trainer and used the Rolls-Royce Merlin engine, with the Sea Balliol a naval version with folding wings and arrestor hook for training in deck landing.
Split into simpler sentences: The Balliol was designed to replace the North American Harvard trainer and used the Rolls-Royce Merlin engine. The Sea Balliol was a naval version with folding wings and arrestor hook for training in deck landing.