Complex sentence: Due to the content discussed in this episode, it was not aired in the United States until a later date, after, the television station, The N, decided to air it during an every episode ever marathon shortly before the premiere of the 6th season.
Split into simpler sentences: Due to the content discussed in this episode, it was not aired in the United States until a later date. It was not shown again until a later date, when The N decided to air an "every episode ever" marathon, before the premiere of the 6th season.