COMPLEX SENTENCE

Each part contains a Subject and a Predicate of its own, and forms part of a large
sentence. Each part is therefore a Clause.
We further notice that the Clause, They rested, makes good sense by itself, and hence
could stand by itself as a complete sentence. It is therefore called the Principal or Main
Clause.
The Clause, when evening came, cannot stand by itself and make good sense. It is
dependent on the Clause, they rested. It is therefore called a Dependent or Subordinate
Clause.
A sentence, such as the fourth, is called a Complex Sentence.