Simplify the following text for a Grade 6 native English-speaking person.
Original: Iepe B. T. Rubingh ( ; born 17 August 1974 ) is a Dutch performance artist and chess boxing founder .
Simplified: Iepe B. T. Rubingh ( ; born 17 August , 1974 ) is a Dutch artist who is best known for starting chess boxing in 2003 .