Complex sentence: As with the past several decades, J-Pop and K-Pop continue to be successful in the Far East; in J-Pop, image songs and the influence of anime on popular music have grown since the end of the last decade.
Split into simpler sentences: As with the past several decades, J-Pop and K-Pop continue to be successful in the Far East. In J-Pop, image songs and the influence of anime on popular music have grown since the end of the last decade.