Complex sentence: However, because this ideology is confirmed as false due to the fact that the majority of Dominicans are of African and European heritage, other groups outside of the Dominican Republic see many Dominicans as having a self-identity crisis.
Split into simpler sentences: However, because this ideology can be viewed as contradictory, as the vast majority of Dominicans are of both African and European heritage. Groups outside the Dominican Republic thus see biased Dominicans as having a self-identity crisis.