Complex sentence: The tapestry in the chapel room is older than the house, and was assessed by an expert as dating to 1450 or earlier; in the early 19th century it had hung in the Red Drawing Room.
Split into simpler sentences: The tapestry in the chapel room is older than the house, and was assessed by an expert as dating to 1450 or earlier. During the early 19th century the tapestry had hung in the Red Drawing Room.