In 1988 the organisational structure of Apple under the direction of John Sculley, adopted the functional organisational structure. However, it was not effective enough to lead the organisation to success. Lack of experience in running a computer company is one of the reasons why it failed.
Although John Sculley himself design the operating system carefully does not really help them move towards their goal. Productions began to produce failed products, leading Apple to its darkest age. During this darkness, there is chaos in the company, there are even rumors saying that marketing teams are designing the product rather than the engineering teams. They are trying to make products that are a head of their time, they moved quickly and failed badly in the end.
Even in 1990, they modified the operating system of Apple, does not really change anything. Apple was in danger of bankruptcy. Then they have no choice but to bring back "Steve Job". It was the right choice to make, and indeed the best solution to Apple's problem. Then it all begins the golden age of the apple.