Complex sentence: It was rebuilt in the 19th century to the original specifications after parts of it collapsed in 1830 during repairs to the castle's foundation: restoration finished in 1988 and the castle opened as a nursing home and remains one today.
Split into simpler sentences: It was rebuilt in the 19th century to original specifications after parts of it collapsed in 1830 during repairs to the castle's foundation. Restoration finished in 1988 and the castle opened as a nursing home and remains one today.