Complex sentence: The casino was slated to open in July 2008, but demolition took longer than expected due to the enormous concrete foundations of the old Steel building, and its opening was delayed until the second quarter of 2009.
Split into simpler sentences: The casino was slated to open in July 2008, but demolition took longer than expected due to the heavy concrete foundations of the old Steel building. Its opening was delayed until the second quarter of 2009.