Complex sentence: The Holy Roman Empire and the pope, who had declared the 1466 Treaty of Thorn invalid invalidated did not verify the "Kuhhandel" (cow trade) of 1525 either arrangement and continued granting the Administration of all of Prussia to the Teutonic Order.
Split into simpler sentences: The Holy Roman Empire and the pope, who had declared the 1466 Treaty of Thorn invalid, did not verify the "Kuhhandel" (cow trade) of 1525 either. The HRE continued granting the Administration of all of Prussia to the Teutonic Order.