Complex sentence: They will commonly work very closely with the director and the production designer during preproduction to find and secure the creative vision expressed by them, and responsible for public relations in regards to the locations used and the safety of the crew during filming.
Split into simpler sentences: They will commonly work closely with the director and the production designer during preproduction to find and secure the creative vision expressed by them. They are also responsible for public relations at the locations used and the safety of the crew during filming.