Instructions have to be broken into little steps and kept very brief.
If you can not do it and show it in about 20 seconds, then do it in stages, demo part 1, then expand to part 2 etc. The key to little kids soccer drills is for every player to have a ball and a variety of 'games', and drills that include every player. The exercise is good for 1 vs 1 dribbling skills. It is especially good on a hot day as the kids defending can rest a bit. Divide the kids into 2 groups.