Complex sentence: Leight explained that Linklater would play a successful businessman, whose son is taken, while Karpovsky was cast as a police officer and Sizemore as an employee of Linklater's character's family.
Split into simpler sentences: Leight explained that Linklater would play a successful businessman, whose son is taken. While Karpovsky was cast as a police officer and Sizemore as an employee of Linklater's character's family.