Simplify the following text for a Grade 14 native English-speaking person.
Original: Caravaggio 's novelty was a radical naturalism which combined close physical observation with a dramatic , even theatrical , use of chiaroscuro that came to be known as Tenebrism , the shift from light to dark with little intermediate value .
Simplified: Caravaggio 's novelty was a radical naturalism which combined close physical observation with a dramatic , even theatrical , approach to chiaroscuro , the use of light and shadow .