Complex sentence: A new HAMS building is in the process of being built due to settling causing major cracks and buckling floors, and is expected to open by the beginning of the 2012-2013 school year.
Split into simpler sentences: A new HAMS building is in the process of being built due to settling in the current building causing major cracks and buckling floors. The new building is expected to open by the beginning of the 2012-2013 school year.