Complex sentence: His title'the Pious' was given to him because he was one of the most Catholic rulers of Bavaria: he devoted his daily routine to masses (when possible, several times a day), prayer, contemplation, and devotional reading.
Split into simpler sentences: His title'the Pious' was given to him because he was one of the most Catholic rulers of Bavaria. He devoted his daily routine to masses (when possible, several times a day), prayer, contemplation, and devotional reading.