Complex sentence: On Horne's front, nine German divisions attacked his weak left flank which was manned by two exhausted Portuguese divisions; the Germans were able to advance six miles to the banks of the River Lawe, where they were repulsed by the 55th and 51st Divisions.
Split into simpler sentences: On Horne's front, nine German divisions attacked his weak left flank which was manned by two exhausted Portuguese divisions. The Germans advanced six miles to the banks of the River Lawe, where they were repulsed by the 55th and 51st Divisions.