Complex sentence: These two latter songs were drenched in echo by Capitol Records'executive Dave Dexter, Jr.-while the rest of the world heard them exactly as recorded by the group, the American release was subject to Dexter's mixing preferences.
Split into simpler sentences: These two latter songs were drenched in echo by Capitol Records'executive Dave Dexter, Jr. for the American release. While the rest of the world heard those two songs exactly as recorded by the group, only the American release was subject to Mr. Dexter's mixing preferences.