Complex sentence: In the days following, Tris' relationship with Four proves to be advantageous--she learns that stage three focused on a more advanced version of the simulations in which the initiates will be ranked according to how many fears show up in their fear landscapes.
Split into simpler sentences: In the days following, Tris' relationship with Four proves to be advantageous. She learns that stage three focuses on a more advanced version of the simulations, and the initiates will be ranked according to how many fears show up in their fear landscapes.