Complex sentence: Bardolph is continually compared to both an angel and a devil, and is Falstaff's loyal and constant companion, functioning as a form of demonic guardian angel, who reminds Falstaff of the mouth of hell to which he may be destined.
Split into simpler sentences: Bardolph is continually compared to both an angel and a devil. He is Falstaff's loyal and constant companion, functioning as a form of demonic guardian angel, who reminds Falstaff of the mouth of hell to which he may be destined.