Complex sentence: On May 2,2010, new traffic patterns were put into effect on Route 70 and 73, and the circle was closed off to traffic and replaced with a regular four-way intersection, which is temporary until the overpass is complete.
Split into simpler sentences: On May 2,2010, new traffic patterns were put into effect on Route 70 and 73, and the circle was closed off to traffic. It was replaced with a regular four-way intersection, which is temporary until the overpass is complete.