Complex sentence: Sam resolves to finish the Quest himself and takes the Ring, but when Orcs take Frodo's body, Sam follows them and learns that Frodo is not dead, but only unconscious, and is now a prisoner.
Split into simpler sentences: Sam resolves to finish the Quest himself and takes the Ring, but when Orcs take Frodo's body, Sam follows them. He learns that Frodo is not dead, but only unconscious, and is now a prisoner.