Complex sentence: Lord Vestey has served as Master of the Horse to the Royal Household, to the Sovereign of the United Kingdom since 1999, who appointed him Knight Commander of the Royal Victorian Order (KCVO) in the 2009 Birthday Honours.
Split into simpler sentences: Lord Vestey has served as Master of the Horse in the Royal Household, to the Sovereign of the United Kingdom since 1999. He was appointed Knight Commander of the Royal Victorian Order (KCVO) in the 2009 Birthday Honours.