Complex sentence: On 4 November 1942, Rommel decided ultimately to end the desperate fighting at El Alamein, and withdrew westwards to Libya, defying the "Stand to the last" orders of his Führer Adolf Hitler in order to save the remainder of his force.
Split into simpler sentences: On 4 November 1942, Rommel decided finally to end the desperate fighting at El Alamein and withdrew westwards to Libya. I doing so, he defied the "Stand to the last" orders of his Führer Adolf Hitler, in order to save the remainder of his force.