Complex sentence: The increasing tension of the Cold War led to a re-evaluation of these deployments and by 1953 SAC bombers began to move further west, behind RAF fighter forces, to Brize Norton, RAF Greenham Common, RAF Upper Heyford, and RAF Fairford.
Split into simpler sentences: The increasing tension of the Cold War led to a re-evaluation of these deployments. By 1953 SAC bombers began to move further west, behind RAF fighter forces, to Brize Norton, RAF Greenham Common, RAF Upper Heyford, and RAF Fairford.