Question

Which of the following sentences is written correctly?
The film, edited by one of the students in the film class, was too long.
The film, have edits by one of the students in the film class, was too long.
The film, editor by one of the students in the film class, was too long.
The film, edit by one of the students in the film class, was too long.

Answer 1

The film, edited by one of the students in the film class, was too long.

Answer 2

The first one is written correctly. 
Hope that helps! :)