Complex sentence: It was one of the "West Texas Bombardier Quadrangle" schools of the Army Air Forces Training Command, along with Childress Army Airfield, San Angelo Army Airfield and Big Spring Army Airfield.
Split into simpler sentences: It was one of the "West Texas Bombardier Quadrangle" schools of the Army Air Forces Training Command. The other bases in the quad were Childress Army Airfield, San Angelo Army Airfield and Big Spring Army Airfield.