Complex sentence: Decommissioning started before the demolition of the plant and clearance of the site, with the final part of the demolition taking place on 8 July 2012 when the 16-storey Tower Block was brought down using high-explosive charges.
Split into simpler sentences: Decommissioning started before the demolition of the plant and clearance of the site. The final part of the demolition took place on 8 July 2012 when the 16-storey Tower Block was brought down using high-explosive charges.