Complex sentence: Precast fins and other precast elements on the exterior were repaired or replaced as necessary, and some of the full-story precast panels were replaced with glass in a manner consistent with the original compositional intent of the building façade.
Split into simpler sentences: Precast fins and other precast elements on the exterior are being repaired or replaced as necessary. Some of the full-story precast panels are being replaced with glass in a manner consistent with the original compositional intent of the building façade.