Complex sentence: The making of "Good Vibrations" was unprecedented in any kind of recording, and its total production cost--estimated between $50,000 and $75,000 ($and $today)--was the most expensive of any music single ever produced.
Split into simpler sentences: The making of "Good Vibrations" was unprecedented in any kind of recording. Its total production cost--estimated between $50,000 and $75,000 ($and $today)--was the most expensive of any music single ever produced.