Complex sentence: The former range of the Hawaiian duck included all of the main Hawaiian islands except the island of Lānaʻi and Kauaʻi.2 Hawaiian ducks were found on the hottest coasts with suitable ponds as well as in the mountains that were up to 7,000 feet high.
Split into simpler sentences: The former range of the Hawaiian duck included all of the main Hawaiian islands except the island of Lānaʻi and Kauaʻi. Studies in Avian Biology 22:61--67 Hawaiian ducks were found on the hottest coasts with suitable ponds as well as in the mountains that were up to 7,000 feet high.