Complex sentence: The Yama Zatdaw was introduced by oral tradition during King Anawratha's reign although it was not known clearly whether the story was Valmiki's Sanskrit epic Ramayana or not.
Split into simpler sentences: The Yama Zatdaw was introduced by oral tradition during King Anawratha's reign. Although it was not known clearly whether the story was Valmiki's Sanskrit epic Ramayana or not.