This question already has an answer here:
This problem comes up a lot when I write text that describes other's work.
to enable personalized Web searches was first proposed in , however in  it was showed to be computationally inefficient.  iterated upon the method and made it suitable for real-time use....
My question is if this is poor style? I've written such paragraphs myself but I have also seen them in real, published research. Hence the question.