Simplify the following text for a Grade 11 native English-speaking person.
Original: Ai Kawashima ( born February 21 , 1986 in Fukuoka City , Fukuoka Prefecture , Japan ) is a Japan singer-songwriter .
Simplified: Ai Kawashima , born February 21 , 1986 in Sawara-ku , Fukuoka , is a Japanese singer-songwriter and pianist .