Complex sentence: In 1918, the war had come to a close, and "Cardiff" had the honour of leading the German High Seas Fleet to the River Forth, whcih was to be interned under the terms of the armistice by remained unter German command.
Split into simpler sentences: In 1918, the war had come to a close, and "Cardiff" had the honour of leading the German High Seas Fleet to the River Forth. The German ships were to be interned under the terms of the armistice, but remained under German command.