Complex sentence: On 15 April 1947, construction commenced on Limestone Army Air Field, the first Strategic Air Command base designed and built to host high-speed aircraft, including the new B-36 Peacemaker.
Split into simpler sentences: On 15 April 1947, construction on the new Limestone Army Air Field commenced. Limestone had the distinction of being the first Strategic Air Command base designed and built for the purpose of hosting high-speed aircraft, including the then-new B-36 Peacemaker.