Complex sentence: Apparently Mardan-Farrukh the author was young, earnest, and well-traveled, acquainted with both the texts and the views of authoritative writers of his own religion, and conversant with other systems of belief.
Split into simpler sentences: Apparently Mardan-Farrukh the author was young, earnest, and well-traveled. He was well acquainted with his own religion, both its texts and the views of its authorities; he also was conversant with other systems of belief.