Complex sentence: This unreliability is often developed by the author to demonstrate that the narrator is psychologically unstable, like the narrator of Poe's Tell-Tale Heart, has an enormous bias, is unknowledgeable, ignorant or childish, or is perhaps purposefully trying to deceive the audience.
Split into simpler sentences: This unreliability is often developed by the author to demonstrate that the narrator is psychologically unstable. The narrator of Poe's Tell-Tale Heart, for example, has an enormous bias, is unknowledgeable, ignorant or childish, or is perhaps purposefully trying to deceive the audience.