영어 문장 구조와 해석 도와주세요

“I believe that the sense of smell, which seems to diminish as we grow older, until it becomes something scarcely worthy of being called a sense, is nearly as keen in little children as in the inferior animals, and, when they live with nature, contributes as much to their pleasure as sight or hearing.”
문장 구조와 해석을 도와주세요ㅠ