Complex sentence: He introduced new administrative methods into the diocese, as well as working to improve the educational and financial well-being of his clergy and to secure the canonization of his predecessor Hugh of Avalon as a saint in 1220.
Split into simpler sentences: He introduced new administration methods into the diocese, as well as working to improve the educational and financial well being of his clergy. He also worked to secure the canonization of his predecessor Hugh of Avalon as a saint in 1220.