Complex sentence: The song saw success on the charts in the British Isles; on the week ending April 30,2009, the song peaked at number four on the Irish Singles Chart, moving from number seven the previous week.
Split into simpler sentences: The song saw success on the charts in the British Isles. On the week ending April 30,2009, the song peaked at number four on the Irish Singles Chart, moving from number seven the previous week.