Simplify the following text for a Grade 9 native English-speaking person.
Original: The album sold 346,000 copies in its first week in the UK and has sold approximately 14 million copies worldwide , although several sources estimate that it has sold in excess of 20 million .
Simplified: The album sold 346,000 copies in its first week in the United Kingdom and has sold around 14 million copies worldwide , but several sources say that it has sold over 20 million .