Complex sentence: Once this is done, the two remaining stages will be surrounded by a glass curtain wall and incorporated into a larger building that will also contain a new smaller theater to be called "The Cradle," intended for debuting experimental pieces.
Split into simpler sentences: Once this is done, the two remaining stages will be surrounded by a glass curtain wall and incorporated into a larger building. This will also contain a new smaller theater to be called "The Cradle," intended for debuting experimental pieces.