Complex sentence: Built by Archibald Hood for his son William, this building was then surpassed by nearby Glyncornel House which was built by the Cambrian Coal Combine for their senior management, but was turned into a maternity hospital in 1939 by Rhondda Borough Council.
Split into simpler sentences: Built by Archibald Hood for his son William, this building was then surpassed by Glyncornal House. Glyncornal House was owned by the Cambrain Coal Combine for their senior management, but was turned into a maternity hospital in 1939 by Rhondda Borough Council.