Task: Text Simplification
Input (English): riaa website although total worldwide album sales are not calculated by any single entity , as of 2004 several industry sources estimated rush 's total worldwide album sales at over 40 million units.
Output (English): the recording industry association of america website : although total worldwide album sales are not counted by any one means , as of 2004 a number of industry sources have estimated rush 's total worldwide album sales at over 40 million units.