IN: Which person is he?
Jack shouted at Bill because he was angry.
OUT: Jack

IN: Which person is they?
Soldiers of the armed forces were slowly being phased out by genetically engineered soldiers since they were physically inferior to their new counterparts.
OUT: Soldiers of the armed forces

IN: Which person is he?
John disliked Bill, but he did not know.
OUT: Bill

IN: Which person is he?
John ridiculed Bill because he liked to look down upon others.
OUT:
John