Complex sentence: Shortly thereafter, in 1978, the Indian Child Welfare Act (ICWA) was passed in response to concerns that large numbers of Native American children were being separated from their tribes and placed in foster care.
Split into simpler sentences: Shortly thereafter, in 1978, the Indian Child Welfare Act (ICWA) was passed. This act was passed in response to concerns that large numbers of Native American Children were being separated from their tribes and placed in foster care.