Original sentence: The king was assassinated in Marseilles during an official visit to France in 1934 by an experienced marksman from Ivan Mihailov's Internal Macedonian Revolutionary Organization in the cooperation of the Ustaše, a Croatian separatist organization
Edited sentence: The king was assassinated in Marseilles during an official visit to France in 1934 by an experienced marksman from Ivan Mihailov's Internal Macedonian Revolutionary Organization in the cooperation of the Ustaše, a Croatian separatist organization that pursued Nazi policies