Complex sentence: Southern California locations were used throughout the film, though location manager John Panzarella said that "period locations are disappearing fast", including several employed in an earlier firm he scouted, "LA Confidential".
Split into simpler sentences: Southern California locations were used throughout the film, presenting a challenge to location manager John Panzarella. He noted that "period locations are disappearing fast", including several employed in an earlier firm he scouted, "LA Confidential".