Respuesta :
"I told him a friend of mine had commissioned me to make some inquiries about a cherished companion" would be a complex sentence because the second half depends on the first.
The answer to your question would be that the sentence in question is a complex sentence. A complex sentence has one independent clause and at least one dependent clause.
Independent clauses are those which represent a complete thought and can stand alone as a sentence. For instance, "Tyrion drinks and knows things". On the contrary, dependent clauses cannot stand alone as a sentence. For example, "*when the cake is brown".