Simplify the following text for a Grade 5 native English-speaking person.
Original: He was last heard on the radio approaching the water after flying off the coast , unable to give his position , and crashed at sea : his body was found by the Brazilian navy near an offshore oil platform on July 4 , 2008 , one day before Couch 's interstate lawnchair balloon flight .
Simplified: He crashed into the sea . The Brazilian navy found his body near an offshore oil platform on 4 July 2008 .