My paper got accepted in AEÜ. I want to make some changes in my article. Can I rewrite some sentences when reviewing the proofs from the journal?
The key word in your question is "some."
If "some" refers to a small number (less than about 10), and the "rewrites" are relatively minor, this should not be a problem. On the other hand, if you have an extensive list of changes spanning multiple pages, and the changes affect the interpretation and argumentation of the article, then the publisher will likely balk at making all of the changes without obtaining editorial approval
In my experience, most journals send the proofs with instructions saying that you should only make changes where errors have been introduced during copy-editing or typesetting. That is, you should correct the journal's errors, not your own. Nevertheless, I've occasionally spotted a few (fewer than 5, even in a long paper) small errors of my own, proposed corrections, and never had any trouble. If I found errors of my own on every second page, I'd be very embarrassed and I'm not sure how publishers would react.
If the article has been accepted my understanding that it is very poor form to change anything that is not grammar/spelling etc.
If you change the meaning of a sentence in any way, even without meaning to, you may change the interpretation of the work in a small way - therefore this is no longer the work that has been accepted, but a different document.