Complex sentence: Originally, episodes 11 and 12 were not planned to be shown together as a two part, one hour combined episode, but the decision was made to present them together after the show was preempted because of Hurricane Sandy.
Split into simpler sentences: Originally, episodes 11 and 12 were not planned to be shown together as a two part, one hour combined episode. But the decision was made to present them together after the show was preempted because of Hurricane Sandy.