"אין להם סוסות."
Translation:They do not have horses.
in Hebrew we don't really have the verb "to have" (and "do not have"), instead we use the words יש/אין. להם indicates that the pronoun "they" it is explained very well in the lesson "there is": https://www.duolingo.com/skill/he/There-is
(with list of all pronouns and how to say it in Hebrew. good luck!)