Complex sentence: With the advent of World War II came the temporary alignment of British and Soviet interests: in 1940, both governments pressured Afghanistan for the expulsion of a large German non-diplomatic contingent, which both governments believed to be engaging in espionage.
Split into simpler sentences: With the advent of World War II, came the temporary alignment of British and Soviet interests in 1940. Both governments pressured Afghanistan for the expulsion of a large German non-diplomatic contingent, which they believed to be engaging in espionage.