Complex sentence: The Monument was erected in 1770, and is an ashlar doric column topped by an urn, to commemorate 29 years of marriage for Edward and Ann Weston of Somerby Hall.
Split into simpler sentences: The Monument was erected in 1770, and is an ashlar doric column topped by an urn. It was erected to commemorate 29 years of marriage for Edward and Ann Weston of Somerby Hall.