Answer:
Dependent clause
Explanation:
The words "When he was like that" form a dependent clause. A dependent, or subordinate clause, is formed by a subject and a verb and starts with a subordinate conjunction (in this case, "when") or a relative prounoun. Also, a dependent clause does not express a full idea on its own. That is why it is dependent: it needs the information expressed by the main clause in order to make sense. For instance:
When he was like that (dependent clause), the whole world seemed to cry with him (main clause).
