Complex sentence: The Whisky a Go Go opened only three days before The Beatles' "I Want to Hold Your Hand" entered the Hot 100 and the subsequent British Invasion knocked almost every American artist off the top of the charts.
Split into simpler sentences: The Whisky a Go Go opened only three days before The Beatles' song "I Want to Hold Your Hand" entered the Hot 100. And the subsequent British Invasion knocked almost every American artist off the top of the charts.