Complex sentence: A character in the short horror story "The Courtyard" by Alan Moore, and the sequel "Neonomicon", is named Carcosa who is later revealed to be originally from another planet or dimension.
Split into simpler sentences: A character in the short horror story "The Courtyard" by Alan Moore, and the sequel "Neonomicon," is named Carcosa. He is later revealed to be from another planet or dimension.