A week or so back, @jagking refined my shuffle function to make it very fast, and in JS one rather doubts it can be much improved. Go back and snag that function (just include attribution with a link to the topic). You can see how it is implemented in the example(s).
We could write a function that changes the case from Title case to Sentence case, but it would still require human inspection to isolate personal pronouns and place names. Might not be the best use of our time, though. Manual changing would get the job done quickly. Whomever thought it a good idea to use Title case might not have given it much more than a passing fancy and figured it was cool. Bad idea, in my humble view.
Aside
Seems every time one asks for the project narrative page it gets ignored. Can you please post a link to the landing page so we can view the criteria and other instructions?