Complex sentence: By the time that Sheppard-Towner was repealed in 1929, the infant mortality rate had fallen to 67.6, with a net decrease of 9.6 deaths per 1000 live births.
Split into simpler sentences: By the time that Sheppard-Towner was repealed in 1929, the infant mortality rate had fallen to 67.6. There was a net decrease of 9.6 decrease in deaths per 1000 live births.