Complex sentence: Milton Gunzburg turned his focus to independent producers and demonstrated Natural Vision to Arch Oboler, producer and writer of radio's popular Lights Out show, who was impressed enough to option it for his next film project.
Split into simpler sentences: Milton Gunzburg turned his focus to independent producers and demonstrated Natural Vision to Arch Oboler, producer and writer of the popular "Lights Out" radio show. Oboler was impressed enough to option it for his next film project.