Complex sentence: When first broadcast on June 14,1990, the episode attracted a Nielsen Rating of 13.6/24, meaning that 13.6% of American households watched the episode, and that 24% of all televisions in use at the time were tuned into it.
Split into simpler sentences: When first broadcast on June 14,1990, the episode attracted a Nielsen Rating of 13.6/24. This means that 13.6% of American households watched the episode, and that 24% of all televisions in use at the time were tuned into it.