Complex sentence: The cruising culture of the early 1960s was depicted in the film "American Graffiti", set (but not actually filmed) in director George Lucas'home town of Modesto, which also hosts an annual "Graffiti Night" celebration in the film's honor.
Split into simpler sentences: The cruising culture of the early 1960s was depicted in the film "American Graffiti". The film was set (but not actually filmed) in director George Lucas'home town of Modesto, which also hosts an annual "Graffiti Night" celebration in the film's honor.