Complex sentence: The mansion was being used as a summer home by the Ruffin family when it was gutted by fire in the mid 1960s, but its ruins still stand (2013) nearly forgotten in the woods above the James.
Split into simpler sentences: The mansion was being used as a summer home by the Ruffin family when it was gutted by fire in the mid 1960s. Its ruins still stand (2013) nearly forgotten in the woods above the James.