Complex sentence: He graduated at twenty-one, was awarded the Carmen Sword of Honour and was commissioned into the Royal Logistic Corps (RLC)--the route that would eventually lead to his becoming an Ammunition Technical Officer (the British Army's counter-terrorist bomb disposal operators).
Split into simpler sentences: He graduated at twenty-one, and was subsequently awarded the Carmen Sword of Honour. He was then commissioned into the Royal Logistic Corps (RLC)--the route that would eventually lead to his becoming an Ammunition Technical Officer (the British Army's counter-terrorist bomb disposal operators).