Complex sentence: The Moody Blues had by now become a bill-topping act in their own right, they appeared twice at the famous Isle of Wight Festival (A DVD of their 1970 performance has now been released).
Split into simpler sentences: The Moody Blues had by now become a bill-topping act in their own right. They appeared twice at the famous Isle of Wight Festival (A DVD of their 1970 performance has now been released).