Simplify the following text for a Grade 7 native English-speaking person.
Original: In Asia at the same time , China had roughly six times the population of Japan , but only an 89 percent higher GDP ; this is reduced to three times the population and only a 38 percent higher GDP if Japanese colonies are included .
Simplified: If colonies are included , the GDP of the Allies then would be two times of that of the Axis . While in Asia , China had only 38 % higher GDP than the Japanese if their colonies are counted .