Complex sentence: The world's highest-paid performer, he headlined the Woodstock Festival in 1969 and the Isle of Wight Festival in 1970 before his accidental death from barbiturate-related asphyxia on September 18,1970, at the age of 27.
Split into simpler sentences: The world's highest-paid performer, he headlined the Woodstock Festival in 1969 and the Isle of Wight Festival. Hendrix died accidentally in 1970 from a barbiturate-related asphyxia overdose, September 18,1970, at the age of 27.