When would 产生了 be used? I don't really understand the meaning or usage of 产生了. Google translate gives 'had'. But it doesn't really seem to be widely-used. When would it be used, and why?
我和书中的人物产生了共鸣：I am able to empathize with characters in the book.
  
  我对学中文产生了浓厚的兴趣：I have got strong interest in learning Chinese.
  
  牛顿的著作对自然科学的发展产生了深远的影响：Newton's great works influence the development
  of natural science significantly.


So many examples I can give since there have been so many nouns that can be the target of the verb 产生.

I would recommend you try to pick up that list of nouns.