Complex sentence: In May 1947, the USAAF awarded the Bell Aircraft Company a second contract, calling for the construction of a supersonic air-to-surface missile compatible with the B-29 Superfortress, the B-36 bomber, and the B-50 Superfortress bomber.
Split into simpler sentences: In May 1947, the USAAF awarded the Bell Aircraft Company a second contract. This contract called for the construction of a supersonic air-to-surface missile compatible with the B-29 Superfortress, the B-36 bomber, and the B-50 Superfortress bomber.