Complex sentence: Sodium thiosulfate, also spelled sodium thiosulphate, is used as a medication to treat cyanide poisoning, pityriasis versicolor, and to decrease side effects from cisplatin.
Split into simpler sentences: Sodium thiosulfate, also spelled sodium thiosulphate, is a chemical and medication. As a medication it is used to treat cyanide poisoning, pityriasis versicolor, and decrease side effects from cisplatin.