Complex sentence: The Whoopee Party was an Mickey Mouse short first released in 1932 on September, 17th in this short Mickey and friends have a party which in Minnie is playing the piano meanwhile Mickey Goofy and Horace are preparing some snacks.
Split into simpler sentences: The Whoopee Party was a Mickey Mouse short first released in 1932 on September, the 17th. In this short Mickey and friends have a party which in Minnie is playing the piano while Mickey Goofy and Horace are preparing some snacks.