Complex sentence: Dudjom Lingpa was also the voice manifestation of Yeshe Tsogyal who was originally a Tibetan queen and then tantric consort to Padmasambhava that also helped him place many of the treasure teachings.
Split into simpler sentences: Dudjom Lingpa was also the voice manifestation of Yeshe Tsogyal who was originally a Tibetan queen and then tantric consort to Padmasambhava. She also said to have helped him place many of the treasure teachings.