Complex sentence: A former British Army officer, his career culminated as Assistant Chief of Defence Staff (Personnel) in the UK Ministry of Defence and at the same he served as the Defence Services Secretary from 2007 to 2010 in the Royal Household.
Split into simpler sentences: A former British Army officer, his military career culminated as Assistant Chief of Defence Staff (Personnel) in the UK Ministry of Defence. At the same he served as the Defence Services Secretary from 2007 to 2010 in the Royal Household.