Simplify the following text for a Grade 12 native English-speaking person.
Original: Since independence , Bujumbura has been the scene of frequent fighting between the country 's two main ethnic groups , with Hutu militias opposing the Tutsi-dominated Burundi army .
Simplified: Since independence , Bujumbura has been the scene of much fighting between the country 's two main ethnic groups , with Hutu militias fighting against the Burundi army which has many Tutsi people in it .