What does this mean? It is a analyse of Orwells The Animal Farm.?

Orwell explained his motive for writing the book in a special preface he wrote for the Ukrainian edition. He intended to expose the transformation of the Soviet Union from Socialism “into a hierarchical state, in which the rulers have no more reason to give up their power than any other ruling class.” Ultimately,the democratic principles of Animalism as defined by old Major are redefined as the totalitarian principles of Napoleon, and the Seven Commandments are changed to accommodate Napoleon’s reign of terror, particularly the two words added at the end of one central commandment to make it read, “No animalshall kill another animal without cause.”