Complex sentence: The song became a smash at dance clubs across the country, which took the song's 12-minute-long mix to number thirteen on Billboard's Hot Dance/Club Singles chart, and number-two on the Hot Disco Songs chart.
Split into simpler sentences: The song became a smash at dance clubs across the country. A 12-minute mix hit No.13 on Billboard's Hot Dance/Club Singles chart and No.2 on the Hot Disco Songs chart.