Complex sentence: After a four-week climb, it reached its peak of number 7 for the week of 8 October to become the band's highest charting UK single; it remained on the chart for the next five weeks.
Split into simpler sentences: After a four-week climb, it reached its peak of number 7 for the week of 8 October to become the band's highest charting UK single. It remained on the chart for the next five weeks.