Complex sentence: He also took part in Sir James Pulteney's expedition to Ferrol in Spain in August 1800 and, having been promoted to captain on 25 June 1803, he joined the Senior Division of the Royal Military College at High Wycombe.
Split into simpler sentences: He also took part in Sir James Pulteney's expedition to Ferrol in Spain in August 1800. He was promoted to captain on 25 June 1803 and shortly afterwards joined the Senior Division of the Royal Military College at High Wycombe.