Complex sentence: Over a ten-year period from 1996 to 2006, numerous improvements were made to the highway--sections were widened, reconstructed, realigned; intersections and stretches through townsites were redesigned, existing bridges were strengthened, and new bridges replaced older bridges or floodways.
Split into simpler sentences: Over a ten-year period from 1996 to 2006, numerous improvements were made to the highway, with sections widened, reconstructed, and realigned. Intersections and stretches through townsites were also redesigned, existing bridges were strengthened, and new bridges replaced older bridges or floodways.