Complex sentence: A problematic form known as "Spiza townsendi?" was collected by John James Audubon in 1833 in Chester County, Pennsylvania, USA and the single specimen is considered unique, but whether or not it constitutes a valid species is undetermined.
Split into simpler sentences: A problematic form known as "Spiza townsendi?" was collected by John James Audubon in 1833 in Chester County, Pennsylvania, USA. The single specimen is considered unique, but whether or not it constitutes a valid species is undetermined.