Complex sentence: The middle class, which is the class with the broadest colour spectrum, is roughly ⅓ white; altogether, about 45% of the lower-middle, upper-middle and upper class Dominicans are white, with mixed-race Dominicans reaching a similar proportion.
Split into simpler sentences: The middle class, which is the class with the broadest colour spectrum, is roughly ⅓ white. Altogether, about 45% of the lower-middle, upper-middle and upper class Dominicans are white, with mixed-race Dominicans reaching a similar proportion.