Complex sentence: Gillette's play features Professor Moriarty as the villain, but Gillette names him "Robert Moriarty", at this point no forename had been given for the Professor in Conan Doyle's stories.
Split into simpler sentences: Gillette's play features Professor Moriarty as the villain, but Gillette names him "Robert Moriarty". At this point no forename had been given for the Professor in Conan Doyle's stories.