Simplify the following text for a Grade 9 native English-speaking person.
Original: Known for his acute analysis of his characters ' psychology , he is considered one of the earliest and foremost practitioners of realism in his two novels Le Rouge et le Noir ( The Red and the Black , 1830 ) and La Chartreuse de Parme ( The Charterhouse of Parma , 1839 ) .
Simplified: He is known for his precise analysis of his characters ' psychology . His two most famous novels are Le Rouge et le Noir ( The Red and the Black , 1830 ) and La Chartreuse de Parme ( The Charterhouse of Parma , 1839 ) .