Complex sentence: It goes through the cities of Reading, Pennsylvania, and Lancaster, Pennsylvania, and in between the two cities for the last several years there has been a high level of construction to renovate the highway, which for the most part, is just about complete.
Split into simpler sentences: It goes through the cities of Reading, Pennsylvania and Lancaster, Pennsylvania. For the last several years there has been a high level of construction to renovate the highway in between those two cities, which for the most part, is just about complete.