Complex sentence: Her orders were to go to Kure, where she would complete her fitting-out and commence to the Inland Sea after which "Shinano" was to take the "Ohka" east for "the relief of the Philippines".
Split into simpler sentences: Her orders were to go to Kure, where she would complete her fitting-out and commence in the Inland Sea. Afterward, "Shinano" was to take the "Ohka" east for "the relief of the Philippines".