Complex sentence: Downstate New York is a term denoting the southeastern portion of New York State, United States, in contrast to Upstate New York, although the term "Downstate New York" has less currency than its counterpart term "Upstate New York".
Split into simpler sentences: Downstate New York is a term denoting the southeastern portion of New York State, United States, in contrast to Upstate New York. The term "Downstate New York" has less currency than its counterpart term "Upstate New York".