Complex sentence: In November 1941 Holmes became General Officer Commanding the British Troops in Egypt, in addition to his responsibilities as commander of X Corps, and in August 1942 he became General-Director of Transportation at the War Office.
Split into simpler sentences: In November 1941 Holmes became General Officer Commanding the British Troops in Egypt, in addition to his responsibilities as commander of X Corps. In August 1942 he became General-Director of Transportation at the War Office.