Simplify the following text for a Grade 9 native English-speaking person.
Original: It is the largest police department in the Midwest and the second largest in the United States after the New York City Police Department with over 13,600 sworn officers and over 2,600 other employees .
Simplified: It is the largest police department in the Midwest and the second largest local law enforcement agency in the United States behind the New York City Police Department . It has over 13,500 sworn officers and over 1,925 other employees .