Complex sentence: Launched in 1839, the "Honorable East India Company Nemesis" was the first British ocean-going iron warship, and was used to great effect in the First Opium War in China.
Split into simpler sentences: Launched in 1839, the Honorable East India Company Ship "Nemesis" was the first British ocean-going iron warship. The British used it to great effect in the First Opium War in China.