Simplify the following text for a Grade 4 native English-speaking person.
Original: As a female singer , Hamasaki holds several domestic records for her singles , such as the most number-one hits overall by a female artist , the most consecutive number-one hits ( also by a female artist ) , the highest sales , and the most million-sellers .
Simplified: She holds many records as a female singers . These include the most number-one hits and highest sales .