Simplify the following text for a Grade 10 native English-speaking person.
Original: Louis Pierre Althusser ( Pronunciation : altuË seÊ ) ( October 16 , 1918 â `` October 22 , 1990 ) was a Marxist philosopher .
Simplified: Louis Pierre Althusser ( ; 16 October 1918 â `` 22 October 1990 ) was a French Marxist philosopher .