Complex sentence: Parton's version of "I Will Always Love You" attained commercial success, twice reaching number one on the "Billboard" Hot Country Songs chart--first in June 1974, and again in October 1982, with her re-recording.
Split into simpler sentences: Parton's version of "I Will Always Love You" attained commercial success. It first reached number one on June 1974, and the second time in October 1982, with her re-recording.