Complex sentence: Roddenberry pursued the project and invited several others to submit story and script ideas, including his personal assistant Jon Povill, as well as writers Robert Silverberg, John D. F. Black and Harlan Ellison.
Split into simpler sentences: Roddenberry pursued the project and invited several others to submit story and script ideas. These included his personal assistant Jon Povill, as well as writers Robert Silverberg, John D. F. Black and Harlan Ellison.