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Do you need commas setting off a “when” clause in a sentence?

As an example: In Quantum Physics when particles are observed their behaviour changes in relation to the fact they're being watched. Does this sentence require a comma before when and a comma ...
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Do I need a comma after “when in (%time)”?

The company had just started to make money when in 1914 the World War put an end to its aspirations. OR: The company had just started to make money when in 1914, the World War put an end to ...