Complex sentence: By the 1980s, more than 12,000 cars were using Route 403 daily to access the business park; the Rhode Island Department of Transportation (RIDOT) estimated that this vehicle volume would exceed 25,000 by 2005.
Split into simpler sentences: By the 1980s, more than 12,000 cars were using the road daily to access the business park. The Rhode Island Department of Transportation estimated that this vehicle volume would exceed 25,000 by 2005.