Complex sentence: The Knebworth Festival, located on the grounds of the Knebworth House in Knebworth, England, is a recurring open air rock and pop concert that started in 1974 when the Allman Brothers Band attracted 60,000 people.
Split into simpler sentences: The Knebworth Festival is a recurring open air rock and pop concert located on the grounds of the Knebworth House in Knebworth, England. It started in 1974 when the Allman Brothers Band attracted 60,000 people.