Complex sentence: Davidson argued that it was vital for II Corps to secure the Gheluvelt Plateau and the Fifth Army corps commanders agreed that taking the area from Inverness Copse to Westhoek would not be enough.
Split into simpler sentences: Davidson argued that it was vital for II Corps to secure the Gheluvelt Plateau. The Fifth Army corps commanders agreed that taking the area from Inverness Copse to Westhoek would not be enough.