Complex sentence: The Madagascar Harrier ("C. macrosceles") of Madagascar and the Comoro Islands was previously treated as a subspecies of this bird but is increasingly regarded as a separate species, however, is slowly going extinct, as it is a highly endangered species.
Split into simpler sentences: The Madagascar Harrier ("C. macrosceles") of Madagascar and the Comoro Islands was previously treated as a subspecies of this bird but is increasingly regarded as a separate species. Sadly, this bird is slowly going extinct, as it is a highly endangered species.