Original sentence: Audience scores such as those found on Rotten Tomatoes, IMDB, and Metacritic require only registration and can not necessarily ensure contributing voters have seen the film.User-generated scores on Rotten Tomatoes and Metacritic were more negative, achieving ratings of 45% and 4.5/10, respectively
Edited sentence: User-generated scores on Rotten Tomatoes and Metacritic, which lack controlled sampling, were more negative, achieving ratings of 45% and 4.5/10, respectively