Complex sentence: The northern birds have its iris of a brownish color and half its maxilla of an orange color, On the other hand, southern birds have their iris violet/green with their maxilar being divided into pink and yellow with black base surrounded with a blush line.
Split into simpler sentences: The northern birds have its iris of a brownish color and half its maxilla of an orange color. Southern birds have their iris violet/green with their maxilar being divided into pink and yellow with black base surrounded with a blush line.