No, the passage does not contain a comma splice error. It is a correctly constructed sentence with a comma used to indicate a pause between the introductory clause "Once upon a time" and the main clause "Percy climbed up a mountain just to write a poem about the experience."
No, the passage does not contain a comma splice error. A comma splice occurs when two independent clauses (complete thoughts) are joined together with only a comma. In the given passage, there is no comma splice because "Once upon a time, Percy climbed up a mountain" is one complete thought, and "just to write a poem about the experience" is a dependent clause that cannot stand alone as a complete sentence.
