Complex sentence: He commanded 20th Armoured Brigade during tours of duty in Kosovo (2001/02) and Iraq (2003/04) and was Commandant of the Royal Military Academy Sandhurst from 2007 to 2009 when he became Military Secretary.
Split into simpler sentences: He commanded 20th Armoured Brigade during tours of duty in Kosovo (2001/02) and Iraq (2003/04). He was Commandant of the Royal Military Academy Sandhurst from 2007 to 2009 when he became Military Secretary.