他/她认识另一个人。
but actually, it would be better if u give more background information about this sentence.
31 Ocak 2015
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We'd better give the sentence a context so that we can translate it correctly. For example:
1. I know a person who knows another person.
我认识的一个人认识另一个人。
2. That is a person who knows another person.
就是那个人认识另一个人。