Complex sentence: In "The Lion's Game", Corey has left the NYPD and become an agent for the fictional FBI Anti-Terrorist Task Force (ATTF) in New York, which is based on the real-life Joint Terrorist Task Force.
Split into simpler sentences: In "The Lion's Game", Corey has left the NYPD and become an agent for the fictional FBI Anti-Terrorist Task Force (ATTF) in New York. The ATTF is based on the real-life Joint Terrorist Task Force.