Complex sentence: Growing up, John worked at a hospital and studied the humanities at a Jesuit (Jesuit) school from 1559 to 1563; the Society of Jesus was a new organization at the time, having been founded a few years earlier by the Spaniard St. Ignatius Loyola.
Split into simpler sentences: Growing up, John worked at a hospital and studied the humanities at a Society of Jesus (Jesuit) school from 1559 to 1563. The Society of Jesus was a new organization at the time, having been founded a few years earlier by the Spanish St. Ignatius Loyola.