Конечно! Давайте переведем предложенные вами предложения на английский, соблюдая необходимые правила и времена:
I realized that I was wrong because he turned out to be an interesting person.
Although this statement was written, the owner of this company did not hire this applicant because of his experience.
Because of his lack of confidence in his skills, he could not advertise this plan. Therefore, he did not earn money from this advertisement.
Если у вас есть дополнительные вопросы или нужны пояснения по конкретным моментам, не стесняйтесь спрашивать!