Complex sentence: Prior to this date, this portion was routed via Quintard Avenue, which constitutes the major north-south business and local route through these cities and is a congested route with many traffic signals and no room for widening.
Split into simpler sentences: Prior to this date, this portion was routed via Quintard Avenue, which constitutes the major north-south business and local route through these cities. It is a congested route with many traffic signals and no room for widening.