Definition: A comma splice error is committed when two or more independent clauses (simple sentences) are joined by only a comma without a coordinating conjunction (and, but, or, nor, for, yet, so) or a semicolon.
Example: John looked into the deserted mine, this was the last time he would visit the place.
Correction: John looked into the deserted mine, for this was the last time he would visit the place.
Correction: John looked into the deserted mine; this was the last time he would visit the place.