Complex sentence: Construction began in 2004 and stalled at 60% completion in 2009 when Siegel's company encountered financial difficulties--and the home was listed for sale at $65 million.
Split into simpler sentences: Construction began in 2004 and stalled in 2009 when 60% competed as Siegel's company encountered financial difficulties. The house was susbsequently listed for sale at $65 million.