Complex sentence: Also, a tin cross was embedded into the concrete of each floor during construction, with the last being added on May 27,2003, and a 30 foot cedar tree was hoisted to the top of the mechanical penthouse during the topping out ceremony.
Split into simpler sentences: Also, a tin cross was embedded into the concrete of each floor during construction, with the last being added on May 27,2003. A 30 foot cedar tree was hoisted to the top of the mechanical penthouse during the topping out ceremony.