Complex sentence: He contended that he had received visions from the founding Bishop of Norwich, Herbert de Losinga, who had died in 1119 telling him that William's body should be moved into the chapter house of the monastery.
Split into simpler sentences: He contended that he had received visions from the founding Bishop of Norwich, Herbert de Losinga, who had died in 1119. Losinga told him that William's body should be moved into the chapter house of the monastery.