Complex sentence: Meanwhile, the property continued to decline and several buildings became uninhabitable, as community activists feared that buildings would collapse and that a developer would purchase the property and seek to build a highrise on the site.
Split into simpler sentences: Meanwhile, the property continued to decline and several buildings became uninhabitable. The Estate became well known with community activists who feared that the buildings would collapse and that a developer would purchase the property and seek to build a highrise building on the site.