Complex sentence: The synthesis of the former starts with an amide from methylamine and diethyl oxalate, which is then cyclizised and chlorinated with phosphorus pentachloride; the nitro group is introduced with nitric acid and sulfuric acid.
Split into simpler sentences: The synthesis of the former starts with an amide from methylamine and diethyl oxalate, which is then cyclizised and chlorinated with phosphorus pentachloride. The nitro group is introduced with nitric acid and sulfuric acid.