If you have more than one Revision of an article, you can choose to Edit the article, go to the Revisions tab, select any revision as desired, and there will be a button to the right to let you restore to that revision version.
I think that covers at least one of your questions you had asked.
Other than restoring revisions, what other sorts of things were you looking to do? I do not think there is an ability to compare revision versions in a way that let you see multiple revisions at once on the screen, no. You can access any revision version, but you would have to open others up in a new tab or new window if you wanted to look at multiple revisions side-by-side.
Let me know if you have other questions on this topic.