Complex sentence: Parks hosted the oldest TV game show that still exists (on kinescope)-- "Party Line" on NBC (broadcast from New York City NBC flagship station WNBT), which involved viewers calling in to answer questions and win $5 prize.
Split into simpler sentences: Parks hosted the oldest TV game show that still exists (on kinescope). The television show is "Party Line" on NBC (broadcast from NYC NBC flagship station WNBT) which involved viewers calling in to answer questions and win $5 prize.