Complex sentence: In the mid- to late-1990s, building owners installed a new façade and exterior lighting after weather damage to the building in 1978,1980, and 1990.
Split into simpler sentences: In the mid- to late-1990s, a new facade and exterior lighting design were installed. The new facade was necessitated, in part, by damage the building had experienced in 1978,1980, and 1990.