Simplify the following text for a Grade 12 native English-speaking person.
Original: The Reformed churches continued use of the Canons as a standard keeps the Reformed churches from being in full harmony with the followers of Jacob Arminius , the Remonstrants and the Dutch Reformed Churches , who disagree with the Canons .
Simplified: Their continued use as a standard still forms an unbridgable problem preventing close cooperation between the followers of Jacob Arminius , the Remonstrants , and Dutch Reformed Churches .