The concept of the unified language he basically explained as there had been a single language in use (the Old Tongue), and the writing and printing of books continued throughout the Breaking, albeit in a very limited extent. The written word introduced a very large conserving factor in the language-change mechanism.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.