Complex sentence: Stuff You Should Know's "beautifully, beautifully done" production has set "the audio standard," according to podcast reviewers Pod on Pod, and the audio quality "could not be improved" on the NPR level production.
Split into simpler sentences: Stuff You Should Know's "beautifully, beautifully done" production has set "the audio standard," according to podcast reviewers Pod on Pod. They added that the audio quality "could not be improved" on the NPR-level production.