Complex sentence: In 1226 he invited the military order of the Teutonic Knights into Prussia to fight the pagans and he granted the fought over Prussian Culmerland to the Teutonic Order and the Order of Dobrin.
Split into simpler sentences: In 1226 he invited the military order of the Teutonic Knights into Prussia to fight the pagans. He also granted lands to the Teutonic Order and the Order of Dobrin.