Complex sentence: Originally recorded under the working title "Sad", "Sappy" dates back to at least 1987, and was recorded several times in the studio, ostensibly because its author, Kurt Cobain, was never completely satisfied with any version of it.
Split into simpler sentences: Originally recorded under the working title "Sad", "Sappy" dates back to at least 1987, and was recorded several times in the studio. The song's writer Kurt Cobain, was never completely satisfied with any version of it.