You may want to avoid using "the reason is because" (like on page 8) in your future translations. The definition of "because" as a conjunction is "for the reason that" and as a result you're creating a redundancy saying "the reason is the reason". Use "the reason is that" instead.
You can look up "the reason is that vs the reason is because" if you want, I'll provide just 2 links. https://getitwriteonline.com/articles/reason-because-or-reason-that/ https://onlinewritingtraining.com.au/2018/07/24/the-reason-is-that-or-the-reason-is-because/