Original sentence: Holy Roman Emperors were crowned by the pope or other Catholic bishops, until Charles V became the last Holy Roman Emperor to be crowned at Bologna, in 1530.Thereafter, until the abolition of the empire in 1806, no further crownings were held
Edited sentence: Holy Roman Emperors were crowned by the pope  until Charles V became the last Holy Roman Emperor to be crowned by the Pope at Bologna, in 1530.Thereafter, until the abolition of the empire in 1806, Imperial coronations were held in Frankfurt and were performed by the Spiritual Princes-Electors,the Archbishops of Cologne,Mainz and Trier