Original sentence: As Roman Catholic Bishop of Warmia (Ermeland), he prevented most towns in his diocese from converting to protestantism while the surrounding hitherto Catholic Ordenstaat of the Teutonic Knights was transformed into the Duchy of Prussia and became the first state to adopt Lutheranism.Shortly before his death, Johannes Dantiscus agreed to become Ferber's  coadjutor, and he was eventually his successor
Edited sentence: As Roman Catholic Bishop of Warmia (Ermeland), he prevented most towns in his diocese from converting to Protestantism while the surrounding hitherto Catholic Ordenstaat of the Teutonic Knights was transformed into the Duchy of Prussia and became the first state to adopt Lutheranism.Shortly before his death, Johannes Dantiscus agreed to become Ferber's coadjutor, and he was eventually his successor