Complex sentence: The toxin present in the spines is triffydin or tryfydin, this toxin contains histamine, serotonin and acetylcholine, the last of which causes powerful stimulation of the parasympathetic nerve system.
Split into simpler sentences: The toxin present in the spines is triffydin (or tryfydin). This toxin contains histamine, serotonin and acetylcholine, the last of which causes powerful stimulation of the parasympathetic nerve system.