Complex sentence: The existing estate remained on a 5.8 acre parcel on the creek that when sold was torn down salvaging marble fireplaces, paneling, and other appurtenances for the construction of the exisiting estate.
Split into simpler sentences: The existing estate remained on a 5.8 acre waterfront parcel that when sold was demolished. However, the owners salvaged marble fireplaces, paneling, and other appurtenances for the construction of the exisiting estate.