Complex sentence: The Kabuki-style song was originally made for Oka, but was sung by Kasuga, and in 1954, "Otomi-san" became a very popular hit in Japan.
Split into simpler sentences: The Kabuki-style song was originally made for Oka, but was sung by Kasuga. In 1954, Kasuga's "Otomi-san" was a very popular hit in Japan.