Complex sentence: He is a green-skinned, armored version of himself with grey horns on his head, arms, chest and back; with a mace in his tail, and his back is covered by a large, spiked shell.
Split into simpler sentences: He is a green-skinned, armored version of himself with grey horns on his head, arms, chest and back; with a mace in his tail. His back is covered by a large, spiked shell.