Complex sentence: One month after Dieppe, most of the 11th Royal Marine Battalion was killed or captured in an ill staged amphibious landing at Tobruk in Operation Agreement, again the Marines were involved with the Argyll and Sutherland Highlanders, this time the 1st Battalion.
Split into simpler sentences: One month after Dieppe, most of the 11th Royal Marine Battalion was killed or captured in an ill staged amphibious landing at Tobruk in Operation Agreement. Again, the Marines were involved with the Argyll and Sutherland Highlanders, this time the 1st Battalion.