I've seen this post but only just had time to investigate.
@Eccles must have seen me combining/uncombining pages to test things.
No reply 15 mins ago - just sorted myself out and came back to reply and Eccles has beaten me to it!
There's a Freeola help page here on combining perhaps a section at could be added about uncombining.
Note the chain and broken chain icon is quite subtle.
If you hover over to see the took tip - you'll see 'Uncombine Page'
If you login to the website builder and go to the Page Manager you should see your combined page(s) listed with the text [Expand]. Click on this to expand the listing and show the individual pages that make up the combined page. Click the broken link image next to each page you wish to uncombine. A dialog confirmation will popup and after clicking the 'Uncombine' button the page will be seperated.