Simplify the following text for a Grade 8 native English-speaking person.
Original: They became one of the most successful British pop groups of the 1990s , with nine Top 10 singles , five number ones , two platinum albums , two gold albums and record sales in excess of 10 million worldwide .
Simplified: The group were one of the most successful British pop groups in the 1990s with nine Top 10 singles , two platinum albums and two gold albums .