Learn English – Is “Happy born day” grammatically correct

It's perfectly fine. Let's rewrite it to see what's going on.

Original:

You're in a box on wheels hurtling along several times faster than evolution could possibly have prepared you to go.

"box on wheels" => "car"
"hurtling along" => "going"

Creates:

You're in a car going several times faster than evolution could possibly have prepared you to go.

Now we can erase this unnecessary part:

You're in a car going several times faster than evolution could possibly have prepared you to go.

Finally creating:

You're in a car going faster than evolution could possibly have prepared you to go.

If you want to go even further, you can simplify all this to:

You're going faster than you are prepared to go.

Seems all fine here!

It is not redundant because "many" and "more" do not mean the same thing. It is simply longer. "More" and "longer" or "better" for example is not grammatically correct because they both serve the same meaning, but many and more do not mean the same thing.

"More happy" is not grammatically incorrect, but the "many more" refers to "returns" not "happy"