An indicator that measures something unrelated to literacy learning- the number of brown-eyed learners, for example - is irrelevant.
(An indicator; measures; something unrelated to literacy learning) (An indicator that measures something unrelated to literacy learning- the number of brown-eyed learners; is; irrelevant)
An indicator An indicator that measures something unrelated to literacy learning- the number of brown-eyed learners
measures is
something unrelated to literacy learning
irrelevant