Suggest changing the title to include both parts, if they fit: "Tim Cook to become Apple Executive Chairman, John Ternus to become Apple CEO"
I'd go with "John Ternus to become Apple CEO[, replacing Tim Cook]"
the bit in brackets ain't even necessary since we all know Tim is the CEO
I'd go with "John Ternus to become Apple CEO[, replacing Tim Cook]"
the bit in brackets ain't even necessary since we all know Tim is the CEO