Complex sentence: There is some disagreement about what to make of trends since the 1980s; while some researchers have presented trends as evidence of "resegregation," others argue that changing demographics in school districts are responsible for most of the changes in the racial composition of schools.
Split into simpler sentences: There is some disagreement about what to make of trends since the 1980s. While some researchers have presented trends as evidence of "resegregation," others argue that changing demographics in school districts are responsible for most of the changes in the racial composition of schools.