Complex sentence: Hence, Björk contacted French director and long-time collaborator Michel Gondry to work on the film and Icelandic poet Sjón to work on the script, in which every song would now be represented by a scene.
Split into simpler sentences: Hence, Björk contacted French director and long-time collaborator Michel Gondry to work on the film and they start working on the script with Icelandic poet Sjón. In the film every song would now be represented by a scene.