Complex sentence: Fine and Friedkin (who previously wrote scripts for radio's "Broadway Is My Beat" and "Crime Classics" under producer/director Elliott Lewis) were co-producers and head writers, and wrote the scripts for 16 episodes, one of which Friedkin directed.
Split into simpler sentences: Fine and Friedkin (who previously wrote scripts for radio's "Broadway Is My Beat" and "Crime Classics" under producer/director Elliott Lewis) were co-producers and head writers. Together they wrote the scripts for 16 episodes, one of which Friedkin directed.