Complex sentence: There it superseded County Route 42 in its entirety; from Keyport east through Hazlet, Holmdel and Middletown Townships it used a part of County Route 7 to its terminus.
Split into simpler sentences: There it superseded County Route 42 in its entirety. From County Route 42, it continued east from Keyport east through Hazlet, Holmdel and Middletown Townships it used a part of County Route 7 to its terminus.