Simplify the following text for a Grade 6 native English-speaking person.
Original: The band had fifteen top ten singles , or songs sold on their own , on the Billboard rock charts , including six # 1 's , and one # 1 album on the pop charts ( 1994 's Purple ) .
Simplified: The band has had 16 top ten singles on the Billboard rock charts , eight of which peaked at # 1 , and one # 1 album for Purple in 1994 .