Complex sentence: Marina City is a mixed-use residential/commercial building complex occupying the entire city block at 300 North State Street in Chicago, Illinois, on the north bank of the Chicago River, directly across from Chicago's Loop district.
Split into simpler sentences: Marina City is a mixed-use residential/commercial building complex occupying an entire city block on State Street in Chicago, Illinois. They lie on the north bank of the Chicago River, directly across from Chicago's Loop district.