Complex sentence: The painting is a half-length, three-quarter view of a young woman, probably in her late teens or early twenties, set against a two-dimensional, diamond-shaped, deep blue-green background.
Split into simpler sentences: The painting is a half-length, three-quarter view of a young woman. She is probably in her late teens or early twenties, set against a two-dimensional, diamond-shaped, deep blue-green background.