Original sentence: The Rivers of Blood speech has been blamed for leading to "Paki-bashing", violent attacks against British Pakistanis and other British Asians, which became frequent after the speech in 1968; however, there is "little agreement on the extent to which Powell was responsible for racial attacks"
Edited sentence: The Rivers of Blood speech has been blamed for leading to "Paki-bashing", violent attacks against British Pakistanis and other British Asians, which were unleashed shortly after the inflammatary speech in 1968; however, there is "little agreement on the extent to which Powell was responsible for racial attacks"