Complex sentence: Burgess Meredith, who starred in four episodes of the original series, took on Serling's position as narrator; unlike Serling he did not appear on screen, nor did he receive screen credit, though his name appears in the end credits.
Split into simpler sentences: Burgess Meredith, who starred in four episodes of the original series, took on Serling's position as narrator. Unlike Serling, he did not appear on screen, nor did he receive screen credit, though his name appears in the end credits.