Complex sentence: The special was seen by 4.1 million viewers, making it Discovery Channel's highest-rated nature program since "Life" in 2010, and was also the second-most popular television program of the night on social media, and the most popular among cable networks.
Split into simpler sentences: The special was seen by 4.1 million viewers, making it Discovery Channel's highest-rated nature program since "Life" in 2010. It was also the second-most popular television program of the night on social media, and the most popular among cable networks.