Simplify the following text for a Grade 6 native English-speaking person.
Original: Nicole Jung ( Korean name : Jung Yong-Joo ) , better known mononymously as Nicole , born on October 7 , 1991 , is an Korean-American singer .
Simplified: Nicole Jung ( Hangul : ì ë ì 1\/2 ; Korean name : Jung Yong-Joo , Hangul : ì ì ì # 1\/4 ) , better known mononymously as Nicole , was born on October 7 , 1991 . She is a Korean-American singer .