Complex sentence: Goschen's telegrams on August 4 to Grey never reached London; whether a state of war existed between Britain and Germany was therefore a confused matter until the expiry of the ultimatum at midnight, Berlin time.
Split into simpler sentences: Goschen's telegrams on August 4 to Grey never reached London. Whether a state of war existed between Britain and Germany was therefore a confused matter until the expiry of the ultimatum at midnight, Berlin time.