Input (grade 13): The case against the three women collapsed "spectacularly" when the chief prosecution witness, Grace Sowerbutts, was exposed by the trial judge to be "the perjuring tool of a Catholic priest".
Output (grade 12): The case against the three women collapsed "spectacularly" when the main witness, Grace Sowerbutts, was shown by the trial judge to be "the perjuring tool of a Catholic priest".