Complex sentence: "Guitar Rag" (played on a Guitjo) became a blues classic and was covered in the 1930s by Bob Wills and the Texas Playboys as "Steel Guitar Rag", which became a country music standard.
Split into simpler sentences: Guitar Rag (played on a Guitjo) became a blues classic. A cover version recorded by Bob Wills and the Texas Playboys in the 1930s as "Steel Guitar Rag" became a country music standard.