Unless you have the original document so a document comparison can be made, there is no way of retrieving the revisions once the changes have been accepted, let alone any changes that have been rejected; even then, you won't be able to retrieve when those changes were made or by whom.
Hence, the only changes for which a history can be retrieved are those that have not been accepted/rejected. To extract a record of those, see:
https://www.msofficeforums.com/133132-post2.html