Question

arrange the pieces to emphasize whom/what the action was done to.
do not change the meaning or tense.
i hide one of enid sinclairs sneakers every morning before swim practice.

Explanation:

To emphasize the receiver of the action (the sneakers), we convert the active sentence to a passive voice structure. We use "by" to indicate the doer, keep the present tense consistent, and place the object of the original sentence at the start.

Answer:

One of Enid Sinclair's sneakers is hidden by me every morning before swim practice.