Complex sentence: There is no official ideology associated with the alt-right, but various sources have linked it to white nationalism, white supremacism,, antisemitism, right-wing populism, nativism, and the neoreactionary movement.
Split into simpler sentences: There is no official ideology associated with the alt-right, but various sources have linked it to white nationalism, white supremacism and antisemitism. The alt-right has also been associated with policies such as right-wing populism, nativism and the neoreactionary movement.