Uh, no. Sign languages, like American Sign Language, are not "simplistic" versions of spoken languages. They are complete, complex languages with their own robust syntax and grammatical structures. A better way to explain this is that it's like an adult who is natively fluent in one language trying to read subtitles in a second language with which they don't have working fluency and rarely, if ever, speak.
Source: My degree in American Sign Language.