Please help me check this Animal Farms' plot

Hi, I've a bit modified a plot of animal farm that i found on internet... I need it for school. Can you check if my grammar is correct please?--------------Manor Farm is a small farm in England run by the harsh and often drunk Mr. Jones. One night a boar named Old Major, knowing that he will soon die, gives a speech to all the animals of the farm, saying that men cause all the misery they endure. Three months later two pigs named Snowball and Napoleon adapt Old Major's ideas into the philosophy of 'Animalism', defeat Jones and rename the farm in 'Animal Farm'. The animals post the 'Seven Commandments of Animalism', stating that all animals are equal and no animal may act like a human. A fight for power soon develops between the two pigs Snowball and Napoleon. The rivalry cames to a head over Snowball's idea to build a windmill. Napoleon tells the other animals that Snowball was a 'bad influence' and sends around a pig named Squealer, who persuades the animals that Napoleon has their best interests at heart. Doing this he becomes the leader of Animal Farm and decides that they should build the windmill after all. The building of the windmill reduces the productivity of the farm, and all the animals except the pigs get less to eat. The pigs begin to trade with other farms and start sleeping into Mr. Jones's bed. This confuses the animals and, over the next few years, Animal Farm battles with its human neighbors and the windmill gets destroyed, first by a storm and then by a human attack. Napoleon exploits this situation using fear tattics and information control to strengthen his power over the farm. Meanwhile, the pigs secretly continue to rewrite the Commandments and all of Animal Farm's history to support their lies. They give the animals less food and demand more work, while eating more and working less themselves. The other animals continue to consider themselves part of a great revolution. When Boxer, the most devoted worker on the farm, is no longer able to work, the pigs sell him to a glue factory and use the proceeds to buy whiskey.Years pass. Now only a few of the remaining animals on the farm experienced the revolution. Even fewer remember its goals. The pigs teach themselves to walk on two legs and when the animals look at the Seven Commandments, they have been replaced by the statement: "All animals are equal. But some animals are more equal than others." The pigs make peace with their human neighbors and have a feast. In the end the other animals can not tell the difference between the pigs and the humans.