Complex sentence: The armed forces again decided to use the balloon which belonged to Jean and Jeannette, and sponsored by the Army Air Corps and National Geographic Society, Settle and Maj. Chester L. Fordney of the U.S. Marine Corps flew to for a new altitude record.
Split into simpler sentences: The armed forces again decided to use the balloon which belonged to Jean and Jeannette. Sponsored by the Army Air Corps and National Geographic Society, Settle and Maj. Chester L. Fordney of the U.S. Marine Corps flew to for a new altitude record.