Complex sentence: It is on the assumption that he was in his teens on admission that his birth date is estimated; some scholars suspect he may have been ten years or more older; many monks only entered monastic life after pursuing a career in the world outside.
Split into simpler sentences: It is on the assumption that he was in his teens on admission that his birth date is estimated; some scholars suspect he may have been ten years or more older. Many monks only entered monastic life after pursuing a career in the world outside.