Complex sentence: Pŏmnang transmitted his teachings to Sinhaeng (died 779), who alson traveled to China, to study with Puji (651--739), a successor of Yuquan Shenxiu (died 706), the head of the socalled Northern School of Chinese Chán.
Split into simpler sentences: Pŏmnang transmitted his teachings to Sinhaeng (died 779), who also traveled to China. Sinhaeng studied with Puji (651--739), a successor of Yuquan Shenxiu (died 706), the head of the so-called Northern School of Chinese Chán.