Complex sentence: Brannon charted three singles in the early 1980s, in addition to receiving a New Female Vocalist of the Year nomination from the Academy of Country Music; in addition, she was signed as an opening act for other country artists.
Split into simpler sentences: Brannon charted three singles in the early 1980s, in addition to receiving a New Female Vocalist of the Year nomination from the Academy of Country Music. She was also signed as an opening act for other country artists.