If it's hard for you to read, it will be even harder for your narrator to read and harder yet for your audience to understand. Write narration that's easy to read and natural sounding. Just don't write too much of it. Let your visuals tell the story as much as possible. By now you have a script.
Chances are it's far too long.
Let's simplify and shorten it. If the viewer is not likely to be interested in a particular scene, eliminate it. You have to be ruthless. Yes, but you really want to tell him about our XYZ process. Sorry, but that isn't good enough.