Complex sentence: Tina Turner never mentions a friend named Jackie in her autobiography; this single character apparently represents an amalgamation of friends from Turner's past, including members of the Ikettes and friends from the band's entourage.
Split into simpler sentences: Tina Turner never mentions a friend named Jackie in her autobiography. This single character apparently represents an amalgamation of friends from Turner's past, including members of the Ikettes and friends from the band's entourage.