Simplify the following text for a Grade 9 native English-speaking person.
Original: On April 20 , 2008 the Brazilian Roman Catholic priest Adelir Antonio de Carli unsuccessfully flew using a chair and 1000 helium balloons .
Simplified: On 20 April 2008 a Brazilian Roman Catholic priest Adelir Antonio de Carli flew using a chair and 1000 helium balloons .