Complex sentence: The ship was returning the bodies of King Kamehameha II and Queen Kamāmalu to the Hawaiian Islands (known by the British as "Sandwich Islands"), after both died from measles during a visit to England.
Split into simpler sentences: The ship was returning the bodies of King Kamehameha II and Queen Kamāmalu to the Hawaiian Islands (known by the British as "Sandwich Islands"). Both the king and the queen had died from measles during a visit to England.