Here is the last part I need to rephrase. I need to simplify the description in two, three sentences.

Thank you!

1)
Sissy is described as so
dark-eyed and dark-haired, that she seems to receive a deeper and more lustrous colour from the sun, when it shines upon her.
2)
In contrast, Bitzer is so light-eyed and light-haired that the self-same rays appear to draw out of him what little colour he ever possesses.
His cold eyes would hardly have been eyes, but for the short ends of lashes which, by bringing them into immediate contrast with something paler than themselves, expressed their form.
3)
His short-cropped hair might have been a mere continuation of the sandy freckles on his forehead and face. His skin is so unwholesomely deficient in the natural tinge, that he looks
as though, if he were cut, he would bleed white.

1) Sissy's dark eyes and hair seem to become richer and more vibrant in the sunlight.

2) In contrast, Bitzer's light eyes and hair appear even paler when exposed to the same rays. The short, pale lashes around his cold eyes accentuate their shape.
3) With short-cropped hair that blends with the sandy freckles on his forehead and face, Bitzer's skin lacks a healthy natural color, almost as if he would bleed white if cut.