You can view the history of any page by editing the page and clicking on the Page History tab while in page edit mode. If the Page History tab is not visible, speak to your system administrator. They can control display of this tab in the Global System Variables manager.
The history includes the modification dates and the name of the user who made the edits.
You can also view the workflow notes history by clicking on the Show Workflow Notes link located in the Page Summary section of the page.