Complex sentence: While Rosenthal claimed to speak for all Jews, his interview is by any standard despicable in content: the interview has not been distributed in the (admittedly Jewish controlled) mainstream media, but neither has it been denounced.
Split into simpler sentences: While Rosenthal claimed to speak for all Jews, his interview is by any standard despicable in content. The interview has not been distributed in the (admittedly Jewish controlled) mainstream media, but neither has it been denounced.