Complex sentence: The axolotl (etymol. Nāhuatl "āxōlōtl" (singular) or "āxōlōmeh" (plural) "water monster") is also known as a Mexican salamander ("Ambystoma mexicanum") or a Mexican walking fish.
Split into simpler sentences: The axolotl (etymol. Nāhuatl "āxōlōtl" (singular) or "āxōlōmeh" (plural) "water monster"). It is also known as a Mexican salamander ("Ambystoma mexicanum") or a Mexican walking fish.