Complex sentence: Some roads are unsigned highways, lacking signage to indicate their maintenance by MDOT; these may be remnants of highways that are still under state control whose designations were decommissioned or roadway segments left over from realignment projects.
Split into simpler sentences: Some roads are unsigned highways, lacking signage to indicate their maintenance by MDOT. These may be remnants of highways that are still under state control whose designations were decommissioned or roadway segments left over from realignment projects.