Complex sentence: The main British posts were along the eastern fringe of Hébuterne and the ridge running south; the valley slope drained water from the area but on the 46th Division front the flat ground was boggy.
Split into simpler sentences: The main British posts were along the eastern fringe of Hébuterne and the ridge running south. The valley slope drained water from the area but on the 46th Division front the flat ground was boggy.