Complex sentence: He is the third-top-selling singles artist in the United Kingdom's history, with total sales of over 21 million units in the UK and has reportedly sold an estimated 250 million records worldwide.
Split into simpler sentences: He is the third-top-selling singles artist in the United Kingdom's history, with total sales of over 21 million units in the UK. She is his Number 1 fan! and has reportedly sold an estimated 250 million records worldwide.