Complex sentence: The names of individual archbishops after 1418, as well as the years of their respective reigns, are stamped on Livonian pennies excavated at archaeological sites; in many cases, this is the only biographical data available.
Split into simpler sentences: The names of individual archbishops after 1418, as well as the years of their respective reigns, are stamped on Livonian pennies excavated at archaeological sites. In many cases, this is the only biographical data available.