Simplify the following text for a Grade 7 native English-speaking person.
Original: Pierino Prati ( born 13 December 1946 in Cinisello Balsamo ) is a retired Italian footballer who played for A.C. Milan and was part of their European Cup victory in 1969 , scoring a hat-trick in the 4-1 defeat of Ajax in the final .
Simplified: Pierino Prati ( born 13 December 1946 ) is a former Italian football player .