Complex sentence: Amateur ornithologist Gregory Mathews described birds from the southern Karri forests as subspecies "warreni" in 1916 on the basis of darker female plumage, Others have not observed this subsequently and the consensus is that no separate subspecies are recognized.
Split into simpler sentences: Amateur ornithologist Gregory Mathews described birds from the southern Karri forests as subspecies "warreni" in 1916 on the basis of darker female plumage. However, others have not observed this subsequently and the consensus is that no separate subspecies are recognized.