Simplify the following text for a Grade 11 native English-speaking person.
Original: Armand Jean du Plessis de Richelieu , Cardinal-Duc de Richelieu ( ; 9 September 1585 â `` 4 December 1642 ) was a French clergyman , noble , and statesman .
Simplified: Armand Jean du Plessis , better known as Cardinal Richelieu ( 9 September 1585 â `` 4 December 1642 ) was a French clergyman , noble , and statesman .