Complex sentence: Bahram IV's son Yazdegerd I (399--421) is often compared to Constantine I. Both were powerful both physically and diplomatically, opportunistic, practiced religious tolerance and provided freedom for the rise of religious minorities.
Split into simpler sentences: Bahram IV's son Yazdegerd I (399--421) is often compared to Constantine I. Like him, he was powerful both physically and diplomatically. Like Constantine the Great, Yazdegerd I practiced religious tolerance and provided freedom for the rise of religious minorities.