Complex sentence: At its peak, MP3.com delivered over 4 million MP3 formatted audio files per day to over 800,000 unique users on a customer base of 25 million registered users--about 4 terabytes of data delivery per month from three data centers.
Split into simpler sentences: At its peak, MP3.com delivered over 4 million MP3 formatted audio files per day to over 800,000 unique users on a customer base of 25 million registered users. This was about 4 terabytes of data delivery per month from three data centers.