Complex sentence: The highway program reduced the site's integrity, on the other hand, it increased funding for emegency archeological investigations, which became intensive, and today continue, and has led to the present understanding of the significance of the site.
Split into simpler sentences: The highway program reduced the site's integrity, on the other hand, it increased funding for emegency archeological investigations. These invsetigations became intensive, and today continue, and have led to the present understanding of the significance of the site.