Complex sentence: The Supreme Court again dismissed the appeal, on the grounds that the case was not "ripe": the plaintiffs had not been charged or threatened with prosecution, so there was no actual controversy for the Court to resolve.
Split into simpler sentences: The Supreme Court again voted to dismiss the appeal, on the grounds that the case was not "ripe". It held that, because the plaintiffs had not been charged or threatened with prosecution, there was no actual controversy for the judiciary to resolve.