Complex sentence: The Doctor speaks to Professor Moorhouse to talk about the myth of the Foretold, a supernatural being who claims its victim 66 seconds after the lights flicker, which they are able to confirm when the train's chef dies in a similar manner as Mrs. Pitt.
Split into simpler sentences: The Doctor speaks to Professor Moorhouse regarding the myth of the Foretold, a supernatural being who claims its victim 66 seconds after the lights flicker. They are able to confirm the Foretold's presence when the train's chef dies in a similar manner as Mrs. Pitt.