Complex sentence: The technique was utilized to build the Inco Superstack in Sudbury, Ontario, and the CN Tower in Toronto, and as of 2010 was currently being used to build the core of the supertall Shard London Bridge tower in London, England.
Split into simpler sentences: The technique was utilized to build the Inco Superstack in Sudbury, Ontario, and the CN Tower in Toronto. In 2010, the technique was used to build the core of the supertall Shard London Bridge tower in London, England.