In addition, the colonization of new lands promoted the dissemination of Eurocentric beliefs depicting native populations as uncivilized or backward. These notions reinforced the concept of race as a tool to rationalize colonization and the imposition of European norms.

make the complicated words in this sentence into something a seventh grader would understand

Furthermore, when new lands were colonized, European beliefs were spread which portrayed native people as uncivilized or not as advanced. These ideas were used to justify colonization and the enforcing of European customs.