Complex sentence: His mother dissuaded him from that career and he became a teacher, he made such a success of being an impromptu teacher to the farmers sons of the Pocklington district, that only a year later he was able to open a village school at Bielby.
Split into simpler sentences: His mother dissuaded him from that career and he became a teacher. He made such a success of being an impromptu teacher to the farmers sons of the Pocklington district, that only a year later he was able to open a village school at Bielby.