Complex sentence: Richard Meinertzhagen considered these three species to be conspecific; however, the range of the Sudan Golden Sparrow overlaps with that of the Chestnut Sparrow without any known interbreeding in a small area of Sudan.
Split into simpler sentences: Richard Meinertzhagen considered these three species to be conspecific. However, the Sudan Golden Sparrow overlaps with the Chestnut Sparrow without any known interbreeding in a small area of Sudan.