Complex sentence: Indian Health Service (IHS) is an Operating Division (OPDIV) within the U.S. Department of Health and Human Services (HHS) that is charged with the responsibility to provide medical and public health services to members of federally recognized Tribes and Alaska Natives.
Split into simpler sentences: Indian Health Service (IHS) is an Operating Division (OPDIV) within the U.S. Department of Health and Human Services (HHS). IHS is responsibility for providing medical and public health services to members of federally recognized Tribes and Alaska Natives.