- A subordinate clause--also termed a dependent clause--expresses a complete thought with a subject and a verb [acting as the predicate]. However, it is dependent upon a main clause for complete meaning. Therefore, it is not a complete sentence.
- A subordinate clause can be either an adjective clause that modifies a noun or pronoun, or an adverb clause that modifies a verb[predicate].
- Subordinate clauses that are adjective clauses begin with such words as that, which, who, etc. (See the link below for more)
- Subordinate clauses that are adverbial clauses begin with subordinating conjunctions such as when, while, whenever, if, until, unless, so that, even though, after, etc. (See the link for more)
In order to combine the above-mentioned sentences using a subordinate clause, the writer can employ an adjective clause:
A person's skin that is exposed to sunlight usually turns darker.