A South Carolina couple has been sentenced to prison for abusing and failing to properly care for six of their children, according to the 14th Circuit Solicitor’s Office.Yulunda Mitchell, 53, of Bluffton, was sentenced to 10 years in prison after pleading guilty Tuesday to 11 counts of unlawful conduct toward a child in Beaufort County General Sessions Court, officials said.Her husband, Herbert Bernard Mitchell, 58,