Complex sentence: Although airborne units were not popular with the top Army commanders, President Franklin D. Roosevelt sponsored the concept and Lee organized the first paratroop platoon, which led to the Provisional Parachute Group, then the United States Airborne Command.
Split into simpler sentences: Although airborne units were not popular with the top U.S. Army commanders, President Franklin D. Roosevelt sponsored the concept, and Lee organized the first paratroop platoon. This led to the Provisional Parachute Group, and then the United States Airborne Command.