Complex sentence: The relative economic deprivation of racial and ethnic minorities leads to higher levels of extended family involvement; primarily because blacks and Latinos have less money and education than whites, they are more likely to give and receive help from kin.
Split into simpler sentences: The relative economic deprivation of racial/ethnic minorities leads to higher levels of extended family involvement. Primarily because blacks and Latinos have less money and education than whites, they are more likely to give and receive help from kin.