Complex sentence: Izumiko learns that she is a "yorishiro", a vessel for a shinto spirit known as a "kami", while Miyuki learns that he is a "yamabushi", a warrior tasked with protecting her.
Split into simpler sentences: Izumiko learns that she is a "yorishiro", a vessel for a shinto spirit known as a "kami". She also learns that Miyuki is a "yamabushi", a warrior tasked with protecting her.