Complex sentence: The second is Janet Jackson with a total of 8 shows, who performed at the Dome in 1990, selling out four shows in 7 minutes, setting a record for the fastest sellout in the history of Tokyo Dome.
Split into simpler sentences: The second is Janet Jackson with a total of 8 shows. American singer Janet Jackson performed at the Dome in 1990, selling out four shows in 7 minutes, setting a record for the fastest sellout in the history of Tokyo Dome.