Simplify the following text for a Grade 13 native English-speaking person.
Original: Stanislav `` Stan '' Mikita ( born Stanislav Guoth on May 20 , 1940 ) , known colloquially as `` Stosh '' , is a Slovak-born Canadian retired professional ice hockey player , generally regarded as the best center of the 1960s .
Simplified: Stan Mikita ( born May 20 1940 in SokolÄ e , Czechoslovakia ) is a Slovakian-Canadian retired professional ice hockey player , generally regarded as the best center of the 1960s .