Simplify the following text for a Grade 6 native English-speaking person.
Original: Stylianos `` Stelios '' Giannakopoulos ( ; born 12 July 1974 in Athens ) , popularly known as Stelios , is a Greek footballer that is currently in FC Absheron .
Simplified: Stelios Giannakopoulos ( born 12 July 1974 ) is a Greek football player .