Original sentence: It found that certain "organized criminals" were able to infiltrate Scotland Yard at will by bribing former and then serving corrupt officers; that the Metropolitan Police suffered “endemic corruption” It is not known whether this police force has extirpated the problem.Operation Tiberius was an official internal Metropolitan Police investigation
Edited sentence: It found that "organized criminals were able to infiltrate Scotland Yard at will by bribing corrupt officers,and they this police  force suffered “endemic corruption” It is not known whether this police force has extirpated the problem.Operation Tiberius was an official investigation into the Metropolitan Police Force, a police force in the United Kingdom