Complex sentence: William Peyton, 15th Hussars, was the commander of the Western Desert Force during the Senussi Campaign, transferred to the Western Front, he was temporarily commander of the Fifth Army, before taking over command of the X Corps.
Split into simpler sentences: William Peyton, 15th Hussars, commanded the Western Desert Force during the Senussi Campaign. He later transferred to the Western Front where he was temporarily commander of the Fifth Army, before taking over command of the X Corps.