Complex sentence: Parts of the division were present in the First Arakan campaign in early 1943, but an intended amphibious assault on Akyab Island, to be mounted by part of the division, was cancelled.
Split into simpler sentences: Parts of the division were present in the First Arakan campaign in early 1943. It was intended that part of the division was to launch an amphibious assault on Akyab Island, but this operation was cancelled.