Complex sentence: According to Nielsen SoundScan, Anthrax has sold 2.5 million records in the United States between 1991 and 2004; the worldwide sales stood at over 15 million records.
Split into simpler sentences: According to Nielsen SoundScan, Anthrax has sold 2.5 million records in the United States between 1991 and 2004. Its worldwide sales stood at over 15 million records.