What is the most effective way to revise sentence 17?

B. The animals win the fight for freedom from humans, only to later lose their freedom to other animals.

In Animal Farm, the main irony is the fact that the animals want to get rid of their "oppressor," the human. However, despite their fight and their idealism, when they do so, they only end up being oppressed by the pigs. This is meant to be a reference to the change of regime in the Soviet Union. While the revolution was meant to end the oppression of the people by the Tsar, it only replaced it with oppression by the communist party.