The Rowlatt Act of 1919 was indeed based on the recommendations of the Sedition Committee, headed by Justice S.A.T. Rowlatt, which investigated 'revolutionary crime' in India (Statement 1 is correct). Mahatma Gandhi launched the Rowlatt Satyagraha against this act and utilized the widespread network and existing infrastructure of the Home Rule League to organize protests and demonstrations across India (Statement 2 is correct). The Simon Commission arrived in India in 1928, almost a decade after the Rowlatt Satyagraha (1919), so demonstrations against it did not coincide with the Rowlatt Satyagraha (Statement 3 is incorrect).