Complex sentence: Increased emphasis on economic development and capital improvement led to an influx of new business, and, as the turnaround reached maturity in 1998, Chelsea won the All-America City Award by the National Civic League.
Split into simpler sentences: Increased emphasis on economic development and capital improvement has led to an influx of new business. As the turnaround reached maturity in 1998, Chelsea won the All-America City Award by the National Civic League.