Complex sentence: "Eye color" is the color of the iris, which in humans can be green, blue, brown, and in rarer cases, hazel (a combination of light brown, green and gold), grey, violet, or even pink.
Split into simpler sentences: Eye color is the color of the iris, which in humans can be green, blue, or brown. In some cases it can be hazel (a combination of light brown, green and gold), grey, violet, or even pink.