Complex sentence: Auchmar House and the remaining contiguous portion of the Buchanan estate is a unique, heritage asset owned by the citizens of Hamilton and is recognized by the Ontario Heritage Trust as having significant historical value.
Split into simpler sentences: Auchmar House and the remaining contiguous portion of the Buchanan estate is a unique, heritage asset owned by the citizens of Hamilton. Auchmar is recognized by the Ontario Heritage Trust as having significant historical value.