Complex sentence: He earned the coveted green beret after completing the commando tests and being drafted to 40 Commando RM at 17, at the same age he went to Kuwait for three months, towards the end of the first Gulf War.
Split into simpler sentences: He earned the coveted green beret after completing the commando tests and being drafted to 40 Commando RM age 17. His first tour of duty was to Kuwait for three months, towards the end of the first Gulf War.