Complex sentence: A few months later, Rommel used his connections to Hitler to obtain command of a Panzer division, after he had been turned down by the Army's personnel office which had offered him command of a mountain division.
Split into simpler sentences: A few months later, Rommel used his connections to Hitler to obtain command of a Panzer division. This was after he had been turned down by the Army's personnel office which had offered him command of a mountain division.