Complex sentence: David Duchovny stated that following the "The X-Files", he wanted to work on a comedy series, but believed casting directors and audiences would not be receptive to his being cast in such a role because of the dark tone of his previous work.
Split into simpler sentences: David Duchovny stated that following the "The X-Files", he wanted to work on a comedy series. But believes casting directors and audiences did not see him in that way because of the dark tone of his previous work.