Complex sentence: Peiper then advanced towards Büllingen, keeping to the plan to move west, unaware he could take the town and unknowingly bypassing an opportunity to flank and trap the entire 2nd and 99th Division.
Split into simpler sentences: Peiper then advanced towards Büllingen, keeping to the plan to move west. Unaware he could take the town and unknowingly bypassing an opportunity to flank and trap the entire 2nd and 99th Division.