Complex sentence: He also hanged himself on an ash tree in order to learn the runic alphabet, but whether this story of Woden provided a non-Celtic source for stories of Herne, or was itself a Saxon adaptation of the original Celtic deity, remains unknown.
Split into simpler sentences: He also hanged himself on an ash tree in order to learn the runic alphabet. But whether this story of Woden provided a, non-Celtic, source for stories of Herne, or was itself a Saxon adaptation of the original Celtic deity, remains unknown.