Complex sentence: Two well-known cuestas in western New York and southern Ontario are the Niagara escarpment and the Onondaga escarpment, where the dip is about 40 feet per mile to the south.
Split into simpler sentences: Two well-known cuestas in western New York and southern Ontario are the Onondaga escarpment and the Niagara escarpment. The dip of the Onondaga is about 40 feet per mile to the south.