Complex sentence: Hans von Pechmann (1850-1902) was a German chemist, renowned for his discovery of diazomethane, Pechmann condensation and Pechmann pyrazole synthesis.
Split into simpler sentences: Hans von Pechmann (1850-1902) was a German chemist. He is renowned for his discovery of diazomethane, Pechmann condensation Pechmann condensation and Pechmann pyrazole synthesis.