Complex sentence: Additionally, this program of research found that the relative degree of feelings of inclusion can help explain White vs minority differences in diversity endorsement, and Whites higher in need to belong will view multiculturalism less favorably.
Split into simpler sentences: Additionally, this program of research found that the degree to which Whites feel included, relative to minorities, can help explain racial differences in diversity endorsement. Furthermore, Whites higher in need to belong will view multiculturalism less favorably.