Complex sentence: The Square fell into disrepair during the years in which Lawrence Tisch was at the helm of CBS, and asbestos problems have been blamed as a reason to demolish the historic broadcasting venue which is widely expected to be demolished once channels 2 and 9 abandon it.
Split into simpler sentences: The Square fell into disrepair during the years in which Lawrence Tisch was at the helm of CBS, and asbestos problems have been cited as a reason to demolish the broadcasting venue. The site is widely expected to be demolished once channels 2 and 9 abandon it.