Simplify the following text for a Grade 12 native English-speaking person.
Original: The Mangla Dam project in the early sixties resulted in the displacement of a large number of people , who under an agreement between the Pakistan government and the British government , were allowed to settle in the UK , where they are usually known as Mirpuri and play a role in the British society , economy , and politics .
Simplified: The Mangla Dam project in the early sixties resulted in the displacement of a large number of people , who under an agreement between the Pakistan government and the British government , were allowed to settle in the UK .