Simplify the following text for a Grade 12 native English-speaking person.
Original: Joseph Beuys ( ; May 12 , 1921 , Krefeld â `` January 23 , 1986 , DÃ 1\/4 sseldorf ) was a German performance artist , sculptor , installation artist , graphic artist , art theorist and pedagogue of art .
Simplified: Joseph Beuys ( pronounced `` boyce '' ) ( May 12 , 1921 â `` January 23 , 1986 ) was a German artist who made arts in many forms including sculpture , performance art , video art , and installations .