I'm not sure you can see the history of changes. I suspect there's an edit history somewhere, but I don't know where. Some of my articles are in Word documents, because they were originally published in magazines. This one was a case in point.

Also, if I suspect editing may occur and I want to keep a check on the original, I'll save a copy. Sometimes I just see words and changes that I know aren't mine, but keeping a copy is worthwhile, if you want to compare.