Complex sentence: The golden poison frog's skin is densely coated in an alkaloid toxin, one of a number of poisons common to dart frogs (batrachotoxins), which prevents nerves from transmitting impulses, leaving the muscles in an inactive state of contraction.
Split into simpler sentences: The golden poison frog's skin is densely coated in an alkaloid toxin, one of a number of poisons common to dart frogs (batrachotoxins). This poison prevents its victim's nerves from transmitting impulses, leaving the muscles in an inactive state of contraction.