Complex sentence: The critically acclaimed first season's run of 22 episodes garnered an average of 2.5 million viewers per episode in the United States; the second season decreased to an average of 2.3 million viewers, however it included the series' highest rated episode with 3.6 million viewers.
Split into simpler sentences: The critically acclaimed first season's run of 22 episodes garnered an average of 2.5 million viewers per episode in the United States. The second season decreased to an average of 2.3 million viewers, however it included the series' highest rated episode with 3.6 million viewers.