Complex sentence: When Pooh, Tigger and Eeyore show up Piglet hasent chose his costume eventully Piglet decides he is to afraid for Halloween and he can't do it so Pooh says no one needs Halloween if there is no Piglet.
Split into simpler sentences: When Pooh, Tigger and Eeyore show up Piglet has not chosen his costume. Eventually Piglet decides he is too afraid for Halloween and he cannot do it, so Pooh says nobody needs Halloween if there is no Piglet.