Complex sentence: Ian Andrew Robert Stewart (18 July 1938--12 December 1985) was a Scottish keyboardist, and co-founder of the Rolling Stones and was inductee into the Rock and Roll Hall of Fame.
Split into simpler sentences: Ian Andrew Robert Stewart (18 July 1938--12 December 1985) was a Scottish keyboardist and co-founder of the Rolling Stones. He was posthumously inducted into the Rock and Roll Hall of Fame.