Complex sentence: With nearly 25 years in the music industry Twain has sold over 85 million records and is the best-selling female artist in the history of country music, which garnered her honorific titles including the "Queen of Country Pop".
Split into simpler sentences: With nearly 25 years in the music industry, Twain has sold over 85 million records and is the best-selling female artist in the history of country music. Her success garnered her several honorific titles including the "Queen of Country Pop".