Complex sentence: In 1980, Cash became the Country Music Hall of Fame's youngest living inductee at age 48, but during the 1980s his records failed to make a major impact on the country charts, although he continued to tour successfully.
Split into simpler sentences: In 1980, Cash became the Country Music Hall of Fame's youngest living inductee at age 48. But during the 1980s, his records failed to make a major impact on the country charts, although he continued to tour successfully.