Complex sentence: The eyes are particularly distinctive, being tubular in shape and directed dorsally (upwards); they have a sideways-oriented diverticulum in the front wall of the eye, though it is unclear what the precise function of this pouch-like pocket is.
Split into simpler sentences: The eyes are particularly distinctive, being tubular in shape and directed dorsally (upwards). They have a sideways-oriented diverticulum in the front wall of the eye, though it is unclear what the precise function of this pouch-like pocket is.