Complex sentence: On 6 August 1944 the first troops of the P.I.B landed at Graye-sur-Mer Normandy, France later the main force landed and the P.I.B served under the Canadian 1st Army until it moved forward with the British 2nd Army.
Split into simpler sentences: On 6 August 1944 the first troops of the P.I.B landed at Graye-sur-Mer Normandy, France. Later the main force landed and the P.I.B served under the Canadian 1st Army until it moved forward with the British 2nd Army.