Complex sentence: It is found in the northern half of Argentina, Bolivia, Uruguay, Paraguay and southern and central Brazil, An isolated population in north-eastern Brazil is usually now considered a separate species, the pale cowbird or pale baywing ("Agelaioides fringillarius").
Split into simpler sentences: It is found in the northern half of Argentina, Bolivia, Uruguay, Paraguay and southern and central Brazil, with an isolated population in north-eastern Brazil. The latter population is sometimes considered a separate species, the pale cowbird or pale baywing ("Agelaioides fringillarius").