Complex sentence: Antonio de Leyva became Lord of Monza in 1529, devoting himself to the government regulation of ecclesiastical affairs, controlling their taxes and duties and shutting the doors of those who did not pay.
Split into simpler sentences: Antonio de Leyva became Lord of Monza in 1529. He devoted himself to the government regulation of ecclesiastical affairs, controlling their taxes and duties and shutting the doors of those who did not pay.