Complex sentence: One of the major projects was the reconstruction of a 286-foot length of highway, including a bridge, at Hue, all of which had been badly damaged during the 1968 Tet Offensive.
Split into simpler sentences: One of the major projects was the reconstruction of a 286-foot length of highway, including a bridge, at Hue. All of which had been badly damaged during the 1968 Tet Offensive.