Complex sentence: He entered the Jesuit novitiate at Nancy, 21 November 1650, and after studying at Pont-à-Mousson he became an instructor at Reims and Verdun.
Split into simpler sentences: He entered the Jesuit novitiate at Nancy, 21 November 1650. After studying at Pont-à-Mousson, he became an instructor at Reims and Verdun.