Complex sentence: Elliott was an American teacher and anti-racism activist who devised an exercise to determine the effects of expectation and discrimination upon children, using differences in eye color to distinguish between perceptions and expectations of "inferior" and "superior".
Split into simpler sentences: Elliott was an American teacher and an anti-racism activist who devised an exercise to determine the effects of expectations and discrimination upon children. She used differences in eye color to distinguish between perceptions and expectations of "inferior" and "superior".