Complex sentence: Its existence is only attested in two sources, dating from the 13th and 14th centuries, the French "Chronicon Universale Anonymi Laudunensis" and the Icelandic "Játvarðar Saga".
Split into simpler sentences: Its existence is only attested in two sources, dating from the 13th and 14th centuries. Namely, the French "Chronicon Universale Anonymi Laudunensis" and the Icelandic "Játvarðar Saga".