Complex sentence: Deliveries of the new Boeing B-47A Stratojet Stratojet to the Air Force and Strategic Air Command began in December 1950 and the aircraft entered service in May 1951 with the 306th Bombardment Wing.
Split into simpler sentences: Deliveries of the new Boeing B-47A Stratojet Stratojet to the USAF began in December 1950. It entered service in May 1951 with the 306th Bombardment Wing.