Complex sentence: Moreover, Duke Berthold fell out with King Henry IV during the fierce Investiture Controversy, when together with Duke Welf I of Bavaria he supported the election of his former rival Duke Rudolf of Swabia as antiking after Henry's Walk to Canossa in 1077.
Split into simpler sentences: Moreover, Duke Berthold fell out with King Henry IV during the fierce Investiture Controversy. Together with Duke Welf I of Bavaria he supported the election of his former rival Duke Rudolf of Swabia as antiking after Henry's Walk to Canossa in 1077.