Complex sentence: The alt-right has been said to include elements of white nationalism, white supremacism, antisemitism, right-wing populism, nativism, and the neoreactionary movement.
Split into simpler sentences: The alt-right has been said to include elements of white nationalism, white supremacism, and antisemitism. It has also been linked to right-wing populism, nativism, and the neoreactionary movement.