Firstly, the whole idea of a chosen one would have thrown in the bin. Anakin would've been a proper slave and not someone who helps out in a shop. Also, he would be in his early teens when we first meet him. His mother AND father would've been killed by the Tuskans when he was very young so he would be truly on his own. And he harbours a lot of anger because of that. Qui Gon would not have been a character (he was pointless) it would've been Obi wan that discovered him. Hmm what else? Maul would've survived until Sith and Anakin would've been the one to kill him, witnessed by Palpatine. No midi chlorians and Gungans (goes without saying) The Clones would've been the enemy and not the droids. The Republic army would've been created through conscripts (real people) I'm not gonna rewrite the whole trilogy here, but these are some of the ideas I personally think would've made the PT a lot better.