Complex sentence: A secret treaty was signed between the Ottoman Empire and the German Empire on August 2,1914 to enter the war on the side of the Central Powers, one day after the German Empire declared war on Russia.
Split into simpler sentences: A secret treaty was negotiated between the Ottoman Empire and the German Empire on August 2,1914. The Ottoman Empire was to enter the war on the side of the Central Powers one day after the German Empire declared war on Russia.