Complex sentence: He informs her about a wizard called Sevoth who was poisoned by a Grull and is the only one who can help Rynn to get to Ravenshold in the Northlands.
Split into simpler sentences: He informs her about a wizard called Sevoth who was poisoned by a Grull. He is the only one who can help Rynn to get to Ravenshold in the Northlands.