Complex sentence: The Doctor and Ian are put in a cell together with another prisoner, Craddock who tells them that ten years before, meteorites brought a plague to Earth, making humans unable to resist when the Dalek saucers landed six months later.
Split into simpler sentences: The Doctor and Ian are put in a cell together with another prisoner, Craddock. Ten years before, meteorites brought a plague to Earth, making humans unable to resist when the Dalek saucers landed six months later.