Complex sentence: In 1952, after spending the winter in Korea, Wilson was posted to the Battle School at Hara Mura, Japan, to train the British contingent, where he dislocated both his shoulders after a hand grenade exploded during a training accident.
Split into simpler sentences: In 1952, after spending the winter in Korea, Wilson was posted to the Battle School at Hara Mura, Japan in order to train the British contingent. During this time he dislocated both his shoulders, after a grenade exploded during a training accident.