Original sentence: During Central Expressway's construction in the 1940s, the southern end of the road was routed through a historic African-American neighborhood, displacing 1,500 black residents.When preparations began for the 1990s expansion of the route, it was discovered that a quarter of the  Freedman's Cemetery, with graves dating back to Emancipation, had been paved over
Edited sentence: But the full scale of the injustice was not revealed until preparations began for the 1990s expansion of the route.Central Expressway's 1940s construction methods would come to represent inadequacies of both civil engineering and social engineering.The living weren't the only ones displaced; a quarter of the  Freedman's Cemetery, with graves dating back to Emancipation, had been paved over.The southern end of North Central Expressway passed through a historic African-American neighborhood, displacing 1,500 black residents