A complex sentence contains one independent clause and at least one dependent clause. Here, in your example, there are two simple independent clauses which you need to merge using a dependent adjectival clause in order to make one complex sentence. Here is how to do it:
The boy <u>who wore a green coat</u><u /> carried his sister home.
I'm pretty confident your answer is adjective. Hope this helped!
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directly quoting the text
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I am doing it right now.
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communication is like a puzzle because there are a variety of elements or 'pieces' that must be present to create a clear message or 'picture'
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