Complex sentence: The two chains are both uninhabited, and are named for the traditional harvesting of the Sooty Shearwater by Maori-these birds are also known as "Muttonbirds", due to their vaguely mutton-like taste.
Split into simpler sentences: The two chains are both uninhabited, and are named for the traditional harvesting of the Sooty Shearwater by Māori. These birds are also known as "Muttonbirds" due to their vaguely mutton-like taste.