Complex sentence: Richelieu therefore charged Isaac Habert, the theologist of Notre-Dame, to preach against Pelagius, while he nominated Alphonse Le Moyne as a professor to the Sorbonne University in order to refutate the "Augustinus".
Split into simpler sentences: Richelieu therefore charged Isaac Habert, the theologist of Notre-Dame, to preach against Pelagius. Richelieu also nominated Alphonse Le Moyne as a professor to the Sorbonne University in order to refutate the "Augustinus".