Mis amigos se levantan (or simply "levantaron" like the person above said) [levantarse] muy tarde.
Explanation:
Simply rearranging these words to try to form a sentence won't make much sense as your subject <<mis amigos (they, masculine)>> is plural and the word <<levantarse>> is infinitive.
The verb <<levantarse>> can be conjugated different ways--it all depends on the tense and the context, so there isn't only one correct answer.
