IN: Which person is he?
Neil Patrick Harris is a better singer than Dave Chappelle,since he does not have time to become a good singer due to his comedy career.
OUT: Dave Chappelle

IN: Which person is he?
George talked to Bill because he had experience.
OUT: Bill

IN: Which person is he?
The police officer chased the thief because he was protecting the bank.
OUT: The police officer

IN: Which person is they?
Gladiators are viewed better than Slaves because they live in a life of servitude instead of dying in glory.
OUT:
Slaves