Complex sentence: Bannon was executive chair of Breitbart News, a far-right news, opinion and commentary website which according to several media and people, Bannon himself included, is indirectly associated with the Internet-based alternative right, or alt-right.
Split into simpler sentences: Bannon was executive chair of Breitbart News, a far-right news, opinion and commentary website. According to several media and people, Bannon himself included, is indirectly associated with the Internet-based alternative right, or alt-right.