Complex sentence: Sixteenth-century Christian humanists considered the reform of catechesis to be a high priority.Bishop of Basel Christoph von Utenheim, in one of the most successful efforts to revive catechesis, worked to have regular catechetical preaching instituted throughout his diocese.
Split into simpler sentences: Sixteenth-century Christian humanists considered the reform of catechesis to be a high priority. One of these, Bishop of Basel Christoph von Utenheim, in one of the most successful efforts to revive catechesis, attempted to have regular catechetical preaching instituted throughout his diocese.