Collins Good Grammar. Graham King

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      You can add more information to a subordinate clause, but regardless of how much extra information you pile on it remains a subordinate clause because it is always subordinate to the main clause, serving only to influence the word patient:

      It’s worth spending a little more time with subordinate clauses because no matter how long they are they have the ability to function as nouns, adjectives and adverbs. Understanding this should help you construct more precise and efficient sentences.

      We recognise three kinds of subordinate clauses:

      Look at the noun clauses closely and you will see that they really do function as nouns. Try mentally rewriting the sentence She told him what she thought as She told him [thoughts] and – Presto! –the clause becomes a noun.

      Do the same for the adjectival clauses. What the sentence This is the door that won’t close properly is saying is, This is the [jammed] door. The adjectival clause that won’t close properly is merely substituting for the adjective jammed. Incidentally, you may have noticed that the adjectival clauses are introduced by the relative pronouns that and which. These and who, where, whose, what and as are typically used for this purpose, which is why you may sometimes see adjectival clauses referred to as relative clauses.