Complex sentence: Wilkin dissuaded a detective who seemed to be on the point of killing Stern and sent for Morton who, fearing there were explosives rigged to go off, had the building evacuated.
Split into simpler sentences: Wilkin dissuaded a detective who seemed to be on the point of killing Stern and sent for Morton. Morton's Account was that fearing there were explosives rigged to go off, he had the building evacuated.