Complex sentence: This project was a reference to Andy Warhol's 1964 film "Empire" which was a silent, eight-hour-long black-and-white film in which the camera focus on the Empire State Building from dusk until dawn.
Split into simpler sentences: This project was a reference to Andy Warhol's 1964 film called the Empire. Empire (1964 film) was a silent, eight-hour-long black and white film in which the camera focus on the Empire State Building from dusk until dawn.