Complex sentence: The finish scattered external light, thereby reducing the amount of external light reaching the eye, but also diffused the internal light of the display, resulting in side-effects including increased blur and eye fatigue, reduced contrast ratio, colour intensity and viewing angle.
Split into simpler sentences: The finish scattered external light, thereby reducing the amount of external light reaching the eye. Unfortunately, this also diffused the internal light of the display, resulting in side effects including increased blur and eye fatigue, and reduced contrast ratio, colour intensity and viewing angle.