Complex sentence: The festival lasts for 11 days, is made up of 11 stages with performances from over 800 acts and over 1000 performances, and since the mid- 1970s has run from late June through early July, usually including the 4th of July holiday.
Split into simpler sentences: The festival lasts for 11 days, is made up of 11 stages with performances from over 800 acts and over 1000 performances. Since the mid- 1970s has run from late June through early July, usually including the 4th of July holiday.