Complex sentence: Pap smears have reduced the incidence and fatalities of cervical cancer in the developed world, but even so it is estimated that there will be 12,900 diagnosed cases of cervical cancer and 4,100 deaths in the U.S. in 2015.
Split into simpler sentences: Pap smears have reduced the incidence and fatalities of cervical cancer in the developed world. In is estimated that there will be 12,900 diagnosed cases of cervical cancer and 4,100 deaths in the U.S. in 2015.