Complex sentence: In addition, he holds the record for the most tracks by a solo artist to hit number one on the Hot Mainstream Rock Tracks chart, with seven, and has been nominated for 13 Grammy Awards, winning one.
Split into simpler sentences: In addition, he holds the record for the most tracks by a solo artist to hit number one on the Hot Mainstream Rock Tracks chart, with seven. Mellencamp has been nominated for 13 Grammy Awards, winning one.