Complex sentence: Caravaggio, who is generally seen as the popularizer of the technique, his Italian and Dutch followers (the Utrecht School), Jusepe de Ribera and his Spanish followers, Georges de La Tour, who painted many images lit by a single candle, and Rembrandt.
Split into simpler sentences: Caravaggio, who is generally seen as the popularizer of the technique, his Italian and Dutch followers (the Utrecht School), Jusepe de Ribera and his Spanish followers. It is sometimes applied to Georges de La Tour, who painted many images lit by a single candle, and Rembrandt.