Adependent clause joins with an independent clause to make a
a. complex sentence
b. compound sentence
c. simple sentence
d. compound-complex sentence

A. Complex sentence.
It contains an independent clause and one or more than one dependent clause. 
An example is: After the game ended, he went back home. 
Where "after the game ended" is the dependent clause and "he went back home" is the independent clause. 

Hope this helps :)