Complex sentence: The islanders have particularly valued blubber: both as food and for processing into oil, which they used for lighting fuel and other purposes like medicine, the blubber of the bottlenose whale is not fit for food, as it gives diarrhea.
Split into simpler sentences: The islanders have particularly valued blubber: both as food and for processing into oil, which they used for lighting fuel and other purposes like medicine. The blubber of the bottlenose whale is not fit for food, as it gives diarrhea.