Complex sentence: In Britain, the Sus law (i.e. a law to enable a police officer to act on suspicion alone) was a stop-and-search law, widely believed to have been abused by the Metropolitan Police to harass young black men.
Split into simpler sentences: In Britain, the Sus law was a stop-and-search law that permitted a police officer to act on suspicion, or 'sus', alone. The law was widely believed to have been abused by the Metropolitan Police to harass young black men.