Complex sentence: The film was followed up by a, although unrelated, sequel called "The Untold Story 2", like the prequel, it was based on an actual crime in Tai Po at the same year when the prequel was released.
Split into simpler sentences: The film was followed up by an unrelated sequel called "The Untold Story 2". Like the prequel, it was based on an actual crime in Tai Po the same year the prequel was released.