Complex sentence: In the end, all of these programs were canceled as engines such as the Allison V-1710, the Pratt and Whitney R-2800 and the Wright R-3350 passed the requirements and continue flying into the 21st century.
Split into simpler sentences: In the end, all of these programs were canceled. Engines such as the Allison V-1710, the Pratt and Whitney R-2800 and the Wright R-3350 passed the requirements, and continue flying into the 21st century.