subordinate clause

US /səˌbɔːrdɪnət ˈklɔːz/
UK /səˌbɔːrdɪnət ˈklɔːz/
"subordinate clause" picture
1.

a clause that adds information to the main clause but cannot stand alone as a complete sentence

:
In the sentence 'I will go to the park if it stops raining,' 'if it stops raining' is a subordinate clause.
Every complex sentence contains at least one main clause and one subordinate clause.