Complex sentence: This staggered and unplanned evolution is indicated by the off-center main door which would once have been central to an earlier façade; as completed and seen today, the house is in a loose Palladian style.
Split into simpler sentences: This staggered and unplanned evolution is indicated by the off-center main door, which would once have been central to an earlier façade. As completed and seen today, the house is in a loose Palladian style.