Complex sentence: The Germans counter-attacked driving the Americans off Djebel el Ahmera but the next night the Guards successfully recaptured the hill only to find, when daylight came, that another summit, Djebel Rhar, remained to be assaulted.
Split into simpler sentences: The Germans counter-attacked driving the Americans off Djebel el Ahmera. The next night the Guards successfully recaptured the hill only to find, when daylight came, that another summit, Djebel Rhar, remained to be assaulted.