Simplify the following text for a Grade 13 native English-speaking person.
Original: During Pakistan 's independence in 1947 , Rafiq Tarar performed voluntary duty as a relief worker in camps set up by Muslim Students Federation for refugees , migrating from India to Pakistan .
Simplified: During Pakistan 's independence in 1947 , Rafiq Tarar worked as a relief worker in camps set up by Muslim Students Federation for refugees , migrating from British India to Pakistan .