Complex sentence: After an intermission for station identification, in which announcer Dan Seymour mentions, that the show is fiction, the last third is a monologue and dialogue, with Welles returning as Professor Pierson, describing the aftermath of the attacks.
Split into simpler sentences: After an intermission for station identification, in which announcer Dan Seymour mentions that the show is fiction, the last third is a monologue and dialogue. Welles returns as Professor Pierson, describing the aftermath of the attacks.