original: Writing After Universal Studios acquired the movie rights to Firefly from Fox, Whedon began writing the screenplay.
simplifications: Writing After Universal Studios acquired the movie rights to Firefly from Fox.  Whedon then began writing the script. After Universal Studios bought the movie rights to Firefly from Fox, Whedon began writing the script. Whedon began writing the movie after Universal got the rights to Firefly from Fox. Writing: Universal Studios acquired the movie rights to Firefly from Fox. Then, Whedon wrote the screenplay. Universal Studios got the movie rights to Firefly from Fox.  Whedon then began writing the screenplay. After Universal Studios bought the movie rights to Firefly, Whedon began writing the script. Whedon began writing the screenplay after Universal Studios received the movie rights to Firefly from Fox. Whedon started writing screenplays after Universal Studios bought the movie rights to Firefly from Fox. Whedon began writing the screenplay after Universal Studios acquired the movie rights to Firefly from Fox. Whedon began writing the screenplay after Universal Studios got the movie rights to Firefly from fox.