Simplify the following text for a Grade 8 native English-speaking person.
Original: Cole joined Nadine Coyle , Sarah Harding , Nicola Roberts , and Kimberley Walsh to comprise the new girl group Girls Aloud , formed through the show by a public vote on 30 November 2002 .
Simplified: She and four other girls , Sarah Harding , Nicola Roberts , Kimberley Walsh , and Nadine Coyle won the competition . They formed a group called Girls Aloud on 30 November 2002 , which has since been very successful .