In "The Stranger" by Albert Camus, how does the syntax and diction impact characterization?

Meursault seems to be a simple fellow, living simply, and being just who he is, with no pretensions. It's like Hemingway--all very simple, until at the end of Part I it changes--both the story and the syntax. Then in Part II the contrast of Meurasult's simplicity with the elaborate and fatuous reasons of the judge and jury and French legal system expresses the weight and complexity of the forces against this man. Meursault is ennobled, seemingly, thereby--although he has still killed a man for no good reason, that I can see.