Complex sentence: He was accused of the murder of Charles Hertel, the white superintendent of St. Clair County schools, in Hertel's office when he refused to renew Wyatt's teaching certification because of "grievous" complaints.
Split into simpler sentences: He was accused of the murder of Charles Hertel, the white superintendent of St. Clair County schools. Allegedly he had killed Hertel in his office when the man refused to renew Wyatt's teaching certification because of "grievous" complaints.