Complex sentence: He excelled at depicting people in their working environments, with the colour and movement of the gaudy night-life present but the glamour stripped away, and masterful when painting crowd scenes in which the figures are highly individualized.
Split into simpler sentences: He excelled at capturing people in their working environment, with the colour and the movement of the gaudy night-life present but the glamour stripped away. He was masterful when it came to capturing crowd scenes in which the figures are highly individualized.