Original sentence: In a TV documentary shown to celebrate the DVD issue of the whole series, those concerned with the production admitted that expensive location shooting and wasted airtime may have contributed to the early cancellation.The first episode set the scene well, but the lack of action between humans and Tripods, and the addition of a romantic interest, made the first series boring and largely irrelevant: the journey across France did not make for arresting TV, and could have been skimmed over in one episode
Edited sentence: The lack of action between humans and Tripods, and the insertion of a romantic interest, made the first series boring and largely irrelevant, and this waste of resources (expensive location shooting) and airtime may have contributed to the series' cancellation