Complex sentence: From time to time additional settlers arrived or shipwrecked mariners decided to remain; in 1827 five coloured women from Saint Helena were induced to migrate to Tristan to become the wives of the five desperate bachelors then on the island.
Split into simpler sentences: From time to time additional settlers arrived or shipwrecked mariners decided to remain. In 1827 they persuaded five coloured women from Saint Helena to migrate to Tristan to become the wives of the five desperate bachelors then on the island.