What is happened with Fernando Alonso and Renault?

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What do you think that happened with Fernando Alonso and renault? 2 Years ago Fernando alonso win the championship with Renault, then they decided change to macclaren but have problem with the other pilots. Why this year cant fernando alonso win with Renault? If you years ago can win,and in one time this year your companion have better position. Qhat do you think that is the problem? Fernando alonso or the cars? What do you think that will happened the next year?