Simplify the following text for a Grade 8 native English-speaking person.
Original: Her son , Rajiv Gandhi , also later became Prime Minister of India . Born Indira Nehru , she married Feroze Gandhi , who had changed his name from `` Feroze Khan '' and was not related to the famous civil rights leader , Mahatma Gandhi , who helped India gain freedom .
Simplified: Indira gained the surname `` Gandhi '' by her marriage to Feroze Gandhi .