Original sentence: Llangorse lake in the Brecon Beacons national park.The Monster of Llangorse Lake documentary by Oll Lewis.The lake is  long and 154 m above sea level1
Edited sentence: Finds included a high quality textile and a bronze hinge from an 8th–9th century reliquary decorated in a style similar to that seen in Ireland.In 2005, works were carried out to protect the island from erosion.It was investigated by archaeologists from the National Museum of Wales between 1989 and 1993.The 1993 dig was joined by the TV series Time Team and featured in series one, episode four in 1994.The crannóg is a small artificial island about 40 m from the north shore.The lake is  long and 154 m above sea level