Complex sentence: Unlike his appearance in the comics, he does not have blue skin, because Goldblum had already played a blue-colored character in "Earth Girls Are Easy", and because the filmmakers did not want to detract from Goldblum's personality by concealing his appearance.
Split into simpler sentences: Unlike his appearance in the comics, he does not have blue skin. This is because Goldblum had already played a blue-colored character in "Earth Girls Are Easy", and because the filmmakers did not want to detract from Goldblum's personality by concealing his appearance.