Simplify the following text for a Grade 8 native English-speaking person.
Original: By this point the city had lost 70 % of its buildings and constructions - the earthquake of 1940 and the air raids contributing to the largest part of this .
Simplified: By this point the city had lost about 70 % of its buildings â `` the earthquake of 1940 and the air raids contributing to the largest part of this .