Complex sentence: One of his most defining features are his eyes which is part of his species not cause they are "shined" as he claims in pitch Black--this allows him to see in the dark with no difficulty at all.
Split into simpler sentences: One of his most defining features are his eyes which is a feature of his species, not because they are "shined" as he claims in Pitch Black. This allows him to see in the dark with no difficulty at all.