Complex sentence: There are more Proposed skyscrapers include Lumiere which began construction in early 2007 prior to its postponement in July 2008 due to the World economy, if completed it would become the tallest residential building in Europe.
Split into simpler sentences: There are more Proposed skyscrapers include Lumiere which began construction in early 2007 prior to its postponement in July 2008 due to the World economy. If Lumiere were to be completed it would become the tallest residential building in Europe.