Simplify the following text for a Grade 11 native English-speaking person.
Original: Because none of the major political events were changed in the book , Adichie said that the book contained `` emotional truth , '' and that the book showed the war had a significant impact upon the people of Nigeria .
Simplified: Because none of the major political events were changed in the book , Adichie said that the book had `` emotional truth , '' and that the book showed the war had a large impact on the people of Nigeria .