Complex sentence: In 1960 the Air Force upgraded an AN/FPS-6A to become a -6B, and integrated the site into the SAGE system, the squadron being re-designated as the 774th Radar Squadron (SAGE) on 15 January 1961.
Split into simpler sentences: In 1960 the Air Force upgraded an AN/FPS-6A to become a -6B. After joining, the squadron was re-designated as the 774th Radar Squadron (SAGE) on 15 January 1961.