Simplify the following text for a Grade 6 native English-speaking person.
Original: Nona Gaprindashvili ( ; born 3 May 1941 ) is a Georgian chess player , the sixth women 's world chess champion ( 1962 â `` 1978 ) , and first female Grandmaster .
Simplified: Nona Gaprindashvili ( born 3 May 1941 ) is a Georgian chess player . She was the strongest female player of the 1960s and 70s , and became the sixth Women 's World Chess Champion ( 1962 â `` 1978 ) .