Complex sentence: In the next three decades the building fell into disrepair again; it lost the canopy over main entrance in 1980s and the wraparound balconies in 2006, torn down for safety reasons.
Split into simpler sentences: In the next three decades the building fell into disrepair again. It lost the canopy over main entrance in 1980s and the wraparound balconies in 2006 were torn down for safety reasons.