Complex sentence: The, commonly abbreviated as, is an early Heian "waka" Imperial anthology, conceived by Emperor Uda (r.887--897) and ordered by his son Emperor Daigo (r.897--930) in approximately 905.
Split into simpler sentences: The, commonly abbreviated as, is an early anthology of the "waka" form of Japanese poetry dating from the Heian. It is an Imperial anthology, conceived by Emperor Uda (r.887--897) and ordered by his son Emperor Daigo (r.897--930) in approximately 905.