By default the synced functionality can be removed when you edit one of the language versions of a page and at the top of the page above the "Publish" button click "stop syncing" link that will split all translated pages.
Another way is trough sitefintiy pages API, this is done by the property LocalizationStrategy:
PageManager manager = PageManager.GetManager();
PageNode page = manager.GetPageNodes().Where(pN => pN.Title ==
PageData pageData = page.Page;
pageData.LocalizationStrategy = LocalizationStrategy.Split;
Please try to split your pages by code and see if this will work.
All the best,
the Telerik team
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