Complex sentence: Postman objects to the presentation of television news as a form of entertainment programming; arguing inclusion of theme music, the interruption of commercials, and "talking hairdos" bear witness that televised news cannot readily be taken seriously.
Split into simpler sentences: Postman objects to the presentation of television news as it is conveyed in the form of entertainment programming. He cites the inclusion of theme music, the interruption of commercials, and "talking hairdos" as the basis for his argument that televised news is presented so that it cannot readily be taken seriously.