Complex sentence: The meme "I'm Not Kidding, Maddi" was also popularized via the group which became a trending topic on social media platforms, such as Facebook and Twitter, and referenced in several news outlets.
Split into simpler sentences: The meme "I'm Not Kidding, Maddi" was also popularized via the group. Which then became a "Trending Topic" on social media platforms, such as Facebook and Twitter, and referenced in several news outlets.