Complex sentence: His design of the Administration Building became known as the Taj Mahal and was added to the National Register of Historic Places in 1987, and the Randolph Field Historic District was added to the National Register of Historic Places in 1996.
Split into simpler sentences: His design of the Administration Building became known as the Taj Mahal and was added to the National Register of Historic Places in 1987. The Randolph Field Historic District was added to the National Register of Historic Places in 1996.