Complex sentence: He follows her and discovers that both Bran and Rickon are alive and well, with Osha explaining that, after reaching the farm, they had doubled back to Winterfell itself to evade Theon's patrols.
Split into simpler sentences: He follows her and discovers that both Bran and Rickon are alive and well. Osha explains that after reaching the farm, they had doubled back to Winterfell itself to evade Theon's patrols.