Complex sentence: The "Grafton" suffered shipwreck off the coast of the islands in 1864, and in 1866 one of New Zealand's most famous shipwrecks, that of the "General Grant" occurred on the western coast.
Split into simpler sentences: The "Grafton" suffered shipwreck off the coast of the islands in 1864. In 1866 one of New Zealand's most famous shipwrecks, that of the "General Grant" occurred on the western coast.