Simplify the following text for a Grade 9 native English-speaking person.
Original: The metropolitan area , with a population of 1,010,970 in the Greater Monrovia District as of the 2008 census , contains 29 % of the total population of Liberia and is the country 's most populous city .
Simplified: It is Liberia 's most populous city with a population of 1,010,970 .