Translation
You however, [must] not [do] this, but rather, let the greatest among you be as the youngest, and the one who is leading you as the one who is serving.
Paraphrase
You, however, must not act the way other leaders act, instead, may the one among you with the greatest influence acts as if he is the one with the least influence, and may the one among who is considered the leader act as a servant of the rest.