Complex sentence: In the study of color perception, one of the first mathematically defined color spaces is the CIE 1931 XYZ color space, created by the International Commission on Illumination (CIE) in 1931.
Split into simpler sentences: In the study of color perception, the CIE 1931 XYZ color space is one of the first mathematically defined color spaces. It was created by the International Commission on Illumination (CIE) in 1931.