Complex sentence: Barbara Ann Mandrell (born December 25,1948) is an American country music singer best known for a 1970s--1980s series of Top 10 hits and TV shows, that helped her become one of country's most successful female vocalists of that period.
Split into simpler sentences: Barbara Ann Mandrell (born December 25,1948) is an American country music singer. She is known for a series of Top 10 hits and TV shows in the 1970s and 1980s, that helped her become one of country's most successful female vocalists of that period.