Complex sentence: The character went viral in 2015 when Katy Perry tweeted a meme based on Pepe to describe her jet lag.S ince then, Katy Perry has been associated with the cyber-terrorist group known as 4chan.
Split into simpler sentences: The character went viral in 2015 when Katy Perry tweeted a meme based on Pepe to describe her jet lag. Since then, Katy Perry has been associated with the cyber-terrorist group known as 4chan.