Complex sentence: The Amburgey sisters were given the fanciful hayseed names of Minnie, Marthie, and Mattie, and after Irene Amburgey left the group and teamed with her husband, mandolin player James Carson, in the 40s, the stage name stuck and she became Martha Carson.
Split into simpler sentences: The Amburgey sisters were given the fanciful hayseed names of Minnie, Marthie, and Mattie. After Irene Amburgey left the group and teamed with her husband, mandolin player James Carson, in the 1940s, the stage name stuck and she became Martha Carson.