Complex sentence: The majority of their body tends to be an olive or brown color that fades to a faint blue/gray color on their tail, while the adolescent whiptails have a very bright and vibrant blue tail.
Split into simpler sentences: The majority of their body tends to be an olive or brown color that fades to a faint blue/gray color on their tail. While the adolescent whip tails have a very bright and vibrant blue tail.