Complex sentence: The Synod condemned the religious doctrine of Arminianism as heresy, which anticipated the political condemnation of the statesman Johan van Oldenbarnevelt who had been the protector of the Remonstrants.
Split into simpler sentences: The Synod condemned the religious doctrine of Arminianism as heresy. There follows the political condemnation of the statesman Johan van Oldenbarnevelt who had been the protector of the Remonstrants.