Simplify the following text for a Grade 7 native English-speaking person.
Original: The anti-tobacco movement did not have much effect in the early years of the Nazi regime and tobacco use increased between 1933 and 1939 , but smoking by military personnel declined from 1939 to 1945 .
Simplified: Tobacco use increased between 1933 and 1939 . But smoking by military personnel declined from 1939 to 1945 .