Complex sentence: Under Campbell's direction, the Rose McClendon Players helped establish the careers of several black artists including Frederick O'Neal, Helen Martin, Edmund Cambridge, Loften Mitchell and Abram Hill.
Split into simpler sentences: Under Campbell's direction, the Rose McClendon Players helped establish the careers of several black artists. Other people that Dick Campbell helped early in their careers included Frederick O’Neal, Helen Martin, Loften Mitchell and Abram Hill.