Complex sentence: Over time, the bridge started to age, with height and weight restrictions imposed to extend its life, but the bridge was eventually declared unsafe and closed to vehicular traffic in 1985, resulting in a 16 kilometre detour.
Split into simpler sentences: Over time, the bridge started to age, with height and weight restrictions imposed to extend its life. The bridge was eventually declared unsafe, and was closed to vehicular traffic in 1985 This resulted in a 16 kilometre detour.