Complex sentence: Her country version of the track was released as a single in 1974 and was written as a farewell to her one-time partner and mentor Porter Wagoner upon Parton's decision to pursue a solo career.
Split into simpler sentences: Her country version of the track was released as a single in 1974. It was written as a farewell to her one-time partner and mentor Porter Wagoner upon Parton's decision to pursue a solo career.