Complex sentence: Amphibians have six types of chromatophore in their skin, i.e. melanophores, xantophores, erythrophores, leucophores, cyanophores and iridophores.
Split into simpler sentences: Amphibians have six types of chromatophore in their skin. There are the melanophores, xantophores, erythrophores, leucophores, cyanophores and iridophores.