Complex sentence: On the other hand, the European Union, the United Nations, Islamic governments, American academia and mainstream media are frequent targets of critical remarks or links, and he believe that there is systemic bias in the "Mainstream Media".
Split into simpler sentences: On the other hand, he has singled out European Union, the United Nations, Islamic governments, American academia, and mainstream media as targets of critical remarks and links. He also believes there is systemic bias in the "Mainstream Media".