Complex sentence: The Lower Passaic River in New Jersey is the of the Passaic River between the Dundee Dam and the river's mouth at Newark Bay in the urbanized northeastern part of the state, its mid-point generally delineating the Essex-Hudson and Passaic-Bergen county lines.
Split into simpler sentences: The Lower Passaic River in New Jersey is the of the Passaic River between the Dundee Dam and the river mouth at Newark Bay in the urbanized northeastern part of the state. Its mid-point generally delineating the Essex-Hudson and Passaic-Bergen county lines.