Complex sentence: By late 1863, the Russian Admiralty Board had begun planning for the second generation of ironclads to succeed those ships then under construction and ordered eight ships, two fully rigged seagoing types and six coastal defense ships, in March 1864.
Split into simpler sentences: By late 1863, the Russian Admiralty Board had begun planning for the second generation of ironclads to succeed those ships then under construction. They ordered eight ships, two fully rigged seagoing types and six coastal defense ships, in March 1864.