Complex sentence: However, Cymer did possess a very large and fine silver gilt chalice and paten, which must have been hidden on the mountainside at the Dissolution; rediscovered in the nineteenth century they are now in the National Museum of Wales in Cardiff.
Split into simpler sentences: However, Cymer did possess a very large and fine silver gilt chalice and paten, which must have been hidden on the mountainside at the Dissolution. These objects were rediscovered in the nineteenth century and are now in the National Museum of Wales in Cardiff.