Sentence Rewriter (Not an article spinner!)

I'd like a program that will allow me to add my article and separate each sentence so I can rewrite it one sentence at a time. Like [login to view URL] except not with all the bells and whistles. I'd prefer to have a blank space for rewriting each sentence under each sentence. This way I"ll know where to begin when returning to my project. When I'm done rewriting each sentence I'd like to hit "Done" button and get my new article. I'd also want it to save my work as I go so I don't lose it. It would be nice to be able to save multiple projects but not a deal breaker. Don't want to spend a ton of money for this. I've been using a word program and just using 2 rows with tables for separating my paragraphs. If you want to use adobe air for operating this on different OS's that's fine too. Doesn't matter. Thanks, James