Complex sentence: Keyes tried to flank the II Giogo Pass by attacking both the peaks of Monticello and Monte Altuzzo using the 91st Infantry Division (nicknamed the "Wild West Division") in a bold attempt to bounce the Germans off the positions, but this failed.
Split into simpler sentences: Keyes tried to flank the II Giogo Pass by attacking both the peaks of Monticello and Monte Altuzzo. Using the 91st Infantry Division (nicknamed the "Wild West Division") in a bold attempt to bounce the Germans off the positions, but this failed.