Original sentence: " Although this work was important in popularizing backpropagation, it was not the first to suggest the approach.Williams, Hinton was co-author of a highly-cited paper published in 1986 that popularized the backpropagation algorithm for training multi-layer neural networks, although they were not the first to propose the approach
Edited sentence: " It is well-known, however, that backpropagation was invented much earlier.Although this work was important in popularizing backpropagation, it was not the first to suggest the approach.Williams, Hinton was co-author of a highly-cited paper published in 1986 that popularized the backpropagation algorithm for training multi-layer neural networks