The sentence "The book, which he gave me, is very informative" is a complex sentence.
To understand what a complex sentence is, first we need to know what independent and dependent clauses are. An independent clause has a subject and a verb and expresses a complete thought on its own, being able to stand alone as a sentence.
On the other hand, a dependent clause does not express a complete thought. It needs another sentence to complete its meaning. It begins with subordinating conjunctions or relative pronouns such as "because", "which", "that", etc.
A complex sentence is formed when we have one independent sentence and one dependent sentence joined together, which is precisely the case of the sentence we are analyzing here:
With the information above in mind, we can say the sentence is complex.
Learn more about complex sentences here:
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