Complex sentence: Smith then insisted on documenting his time with the Banshees, so the group released a cover version of The Beatles' "Dear Prudence" in September 1983; it became their biggest hit, reaching number 3 on the UK Singles Chart.
Split into simpler sentences: Smith then insisted on documenting his time with the Banshees, so the group released a cover version of The Beatles' "Dear Prudence" in September 1983. It became their biggest hit, reaching number 3 on the UK Singles Chart.