Complex sentence: Cade stops the Knights with the talisman, which transformed into the sword Excalibur, and the Knights yield to Cade as the last Knight, who then urges Optimus to fight for Earth once more.
Split into simpler sentences: Cade stops the Knights with the talisman, which transformed into the sword Excalibur, and the Knights yield to Cade as the last Knight. He then urges Optimus to fight for Earth once more.