Complex sentence: The battery never rejoined the division; on 28 November 1915 the battery departed Ismailia for the Western Desert where it joined the Western Frontier Force on formation at Mersa Matruh on 30 November.
Split into simpler sentences: The battery never rejoined the division; on 28 November 1915 the battery departed Ismailia for the Western Desert. It joined the Western Frontier Force on formation at Mersa Matruh on 30 November.