Complex sentence: Republic and Wookiee forces were seen to be destoying many of the Seperatist invasion vehicles, however the last we see of the battle during the order 66 montage shows that still more droids are arriving.
Split into simpler sentences: Republic and Wookiee forces were seen to be destroying many of the Separatist invasion vehicles. However, the last we see of the battle during the Order 66 montage shows that still more droids are arriving.