Complex sentence: Vomitoxin belongs to a class of mycotoxins (tricothecenes) which are strong inhibitors of protein synthesis; exposure to vomitoxin causes the brain to increase its uptake of the amino acid tryptophan and, in turn, its synthesis of serotonin.
Split into simpler sentences: Vomitoxin belongs to a class of mycotoxins (tricothecenes) which are strong protein inhibitors. Inhibition of protein synthesis following exposure to vomitoxin causes the brain to increase its uptake of the amino acid tryptophan and, in turn, its synthesis of serotonin.