Find the page you want change, hover your mouse over it and click "Edit"

In the "Publish Box", you will see an option for "Revisions" with a number next to it - this indicates how many versions of this page there are stored in the site. Click "Browse"

You will then be presented with the last revision of the page, and you will be able to see who made the changes and when they were made.

 Compare any two revisions
Current Revision by phwadmn
1 year ago (14 July @ 14:01)
Title
Homepage		Homepage
- Text (layout_4_intro)
Removed	Added

Deleted: 
	
Added: 
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You will then be able to scroll through previous versions of the page using the scroll bar and buttons across the top of the page

You will see two columns; the left side is what the content was before the last save and the right side is what it was changed into. You can see exactly what was changed by looking for highlighted content

Selecting "Restore This Revision" will immediately revert the page back to the selected dated page.

How to Use Revisions in WordPress