Combine each pair of sentences that follow into one sentence by creating a subordinate clause that presents information about a verb.A person's...

• 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.