Simplify the following text for a Grade 6 native English-speaking person.
Original: Ian Kevin Curtis ( 15 July 1956 â `` 18 May 1980 ) was the songwriter , lyricist , singer and occasional guitarist of the English post-punk band Joy Division .
Simplified: Ian Kevin Curtis ( 15 July 1956-18 May 1980 ) was the singer of the band Joy Division .