Complex sentence: In 1878, he became Secretary for the Chicago Academy of Design that later became the Chicago Academy of Fine Arts (1979), which was then reorganized as the Art Institute of Chicago (1882).
Split into simpler sentences: In 1878, he became Secretary of The Chicago Academy of Design which was later reorganized as the Chicago Academy of Fine Arts (1979). The Chicago Academy of Fine Arts changed its name to The Art Institute of Chicago in (1882).