Complex sentence: In 2016, year of a United States presidential election, Pepe was alleged to have became associated with Donald Trump's campaign, white nationalism, and the alt-right movement and has been described as a symbol for each of them.
Split into simpler sentences: In 2016, year of a United States presidential election, Pepe became associated with Donald Trump's campaign, white nationalism, and the alt-right movement. It has been described as a symbol for each of them.