Simplify the following text for a Grade 7 native English-speaking person.
Original: Claiton Alberto Fontoura dos Santos or simply Claiton ( born January 25 , 1978 , in Porto Alegre ) is a Brazilian midfielder who plays for AtlÃ tico-PR .
Simplified: Claiton Fontoura dos Santos ( born 25 January 1978 ) is a Brazilian football player .