Complex sentence: When the building was acquired by Bank of America as part of the company's acquisition of LaSalle Bank from ABN AMRO in the spring of 2008, the green and yellow shield icon was removed from the building's top.
Split into simpler sentences: When the building was acquired by Bank of America as part of the company's acquisition of LaSalle Bank from ABN AMRO. In the spring of 2008, the green and yellow shield icon was removed from the building's top.