Complex sentence: The Stephens Island Wren or Lyall's Wren ("Xenicus (Traversia) lyalli") was a nocturnal, flightless, insectivorous passerine eventually found only on Stephens Island, although it had been widespread throughout New Zealand before the land was settled by Māori.
Split into simpler sentences: The Stephens Island Wren or Lyall's Wren ("Xenicus (Traversia) lyalli") was a nocturnal, flightless, insectivorous passerine. Historically it found only on Stephens Island, although prehistorically it had been widespread throughout New Zealand before the land was settled by Māori.