I find it to be a fragment. I would expect something at the end to match up with the "so much... that..." structure, like:
So conscientious are the authorities that we can send our children to schools when they are younger that they've recently enacted a law giving government assistance to parents who need help paying for pre-school.
In the context I'm discussing whether it is better to send our children to schools when they are seven or they should be sent when they are younger. Finally after discussing the advantages and disadvantages I would say "So conscientious are the authorities of schools that we can send our children to schools when they are younger."; that means we do not need to be worried about our children; the authorities of schools are as conscientious as mothers.