Complex sentence: Pettibone is opposed to multiculturalism, feminism, the Black Lives Matter movement, and is supportive of American nationalism, considers America a European nation, along with massive deportations of undocumented immigrants from the United States in order to establish a white ethnic state.
Split into simpler sentences: Pettibone is opposed to multiculturalism, feminism, Black Lives Matter, and is an American nationalist. She supports large-scale deportations of undocumented immigrants from the United States in order to establish a white ethnic state.