Complex sentence: The song reached number 10 on the U.S. "Billboard" Mainstream Rock Tracks chart, and was Earle's highest-peaking song to date on the rock chart in the United States.
Split into simpler sentences: The song reached number 10 on the U.S. "Billboard" Mainstream Rock Tracks chart. It was Earle's highest peaking song to date on the rock chart in the United States.