Complex sentence: Dekus have red glowing eyes and there "mouths" are short wide hallow tubes that they can't shut closed.because of this they can't swim whithout drowning but thats okay because they can "water-Hop" (hop acrose the surface of the water).
Split into simpler sentences: Dekus have red glowing eyes and their mouths are short wide hollow tubes that they can't shut tight. Because of this, they can't swim whithout drowning but they can "water-op" (hop acrose the surface of the water).