Complex sentence: The present bridge was constructed during the reign of Edward I. Legend says that when the king crossed over on his way to participate in the Welsh Wars he said that if a stone bridge was not built on his return he would sack the city.
Split into simpler sentences: The present bridge was constructed during the reign of Edward I. Legend says that when the king crossed over on his way to participate in the Welsh Wars. He said that if a stone bridge was not built on his return he would sack the city.