I guess what you are trying to say in your first four sentences is in the wake of the global financial crisis, firms are trying to focus more on some specific growing industries. Therefore, conglomerate companies such as General Electric, General Motor are out of favor by stock investors.
You may want to focus on the shift from diversification to specific growing industries. Therefore, I think you can start with introducing conglomerates first, and how the trend changes from diversification to investing in some specific growing industry. It may be helpful to compare two companies such as General Electric with Apple. The first is around for more than one hundred years and is currently out of favor by stock investors. The second is among the best growing company, with market capital around $269 billion, second biggest company in the world behind Exxon Mobil...
That is just my suggestion about how to capture readers' attention. Let me know what you think.
Student or Learner