Complex sentence: According to Gates, his most celebrated project is the Dorchester Projects on the South Side of Chicago, where he restored dilapidated buildings and turned them into cultural institutions with artifacts from the South Side.
Split into simpler sentences: According to Gates, his most celebrated project is the Dorchester Projects on the South Side of Chicago. With the Dorchester Projects he restored dilapidated buildings and turned them into cultural institutions with artifacts from the South Side.