Clauses
A complex sentence is composed of an independent clause and at least one Subordinate or Dependent Clause, which adds information to the independent clause and cannot stand alone as a complete thought. These fragments of the sentences are linked by different kinds of connectors.
Subordinate Clause: clause that cannot form a sentence by itself, but can be combined with a main clause to form a sentence.
A complex sentence containing a Subordinate or Dependent Clause has this structure:
Independent clause (Subject+verb) + connector + Subordinate clause (Subject + verb)
| Independent Clause | Subordinate (dependent) Clause |
| She was studying | while Mary and John were walking in the park. |
| They went on a long road trip | even though their parents wanted them to spend the summer at home. |
| They spent the night at the beach | until dawn broke into a beautiful sunrise. |
Subordinate or Dependent Clause adds information to the independent clause and cannot stand alone as a complete thought. Subordinate Clauses may contain compound subjects (more than one subject).
We use a subordinate (dependent) clause to add information to the independent clause. A complex sentence in English is made up of an independent clause and a subordinate clause. When we wish to form a complex sentence containing a subordinate clause, we have to follow the following structure: Independent clause (Subject+verb) + connector + Subordinate clause (Subject + verb). You can find examples of complex sentences (with the independent and subordinate clauses marked clearly) in the Example section. Important: a subordinate clause cannot stand alone as a complete thought (we need to have an independent clause and connector).