Earlier quoted context omitted.
Find the old text somewhere. Get the new text. Copypaste both in a text file. Then use diff or meld or another difftool of your choice to compare the two text files.
Presumably they meant, when you're 'asked to agree' to new T&C's the diff changes in the new policy are highlighted. When presented with a new T&C's policy, shouldn't you explicitly be asked to agree to any changes from the previous one you agreed to rather than be presented with the entire 14 pages which approximately 0.00001% of people will ever read before agreeing to? (And please don't say you read every EULA you…
In general: people who don't take the time to read or consider their Terms of Service are not going to take the time to read or consider the changes.