Complex sentence: The actual dispatch was an internal message from the Prussian King's vacationing site to Bismarck in Berlin, reporting about demands made by the French ambassador, and thus it was Bismarck's released statement to the press which became known as "Ems Dispatch".
Split into simpler sentences: The actual dispatch was an internal message from the Prussian King's vacationing site to Bismarck in Berlin, reporting about demands made by the French ambassador. Bismarck then released a statement to the press which became known as "Ems Dispatch".