Complex sentence: Another prisoner of Zinyak, an artificial intelligence later named CID, helps the Saints after being provided with a physical body, and with CID's help, the Boss goes into the other Saint's simulations and rescues them from their nightmares.
Split into simpler sentences: Another prisoner of Zinyak, an artificial intelligence later named CID, helps the Saints after being provided with a physical body. With his help, the Boss goes into the other Saint's simulations and rescues them from their nightmares.