Lo que hacen las armas muy peligrosas es cuando se los niños utilizan por placer.
What make guns very dangerous is when kids use them for fun.
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.
Translation into spanish:
The original sentence:
Has several mistakes: