Complex sentence: Area code 570 is a Commonwealth of Pennsylvania telephone area code which serves the northeast corner of the state including the cities of Williamsport, Wilkes-Barre, Scranton, and Sayre.
Split into simpler sentences: Area code 570 is a Commonwealth of Pennsylvania telephone area code. The 570 code serves the northeast corner of Pennsylvania, including the cities of Williamsport, Wilkes-Barre, Scranton, and Sayre.