Complex sentence: Palisade Avenue, running along the spine of the area, is the only street that retains it name as passes through all the communities, and continues north into the southeastern Bergen County, with which it is geologically and historically connected.
Split into simpler sentences: Palisade Avenue, running along the spine of the area, is the only street that retains it name as passes through all the communities. It continues north into the southeastern Bergen County, with which it is geologically and historically connected.