Complex sentence: Some 22,500 Spitfires and Seafires were built between 1938 and 1946 and almost 300 of them survive in museums and private collections around the world today.55 Spitfires and Seafires are airworthy with another 20 currently undergoing restoration to flying condition.
Split into simpler sentences: Some 22,500 Spitfires and Seafires were built between 1938 and 1946 and almost 300 of them survive in museums and private collections around the world today. Approximately 50 Spitfires and Seafires are airworthy with another 20 currently undergoing restoration to flying condition.