Complex sentence: According to a Tongan story, a group of Tongans once arrived by boat at the Tui Tonga, but they had had a rough ride and their clothing, if any remained, was not respectable.
Split into simpler sentences: According to a Tongan story, a group of Tongans once arrived by boat at the Tui Tonga. They had had a rough ride and their clothing, if any remained, was not respectable.