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Is the following sentence a complex sentence or a compound sentence?
My brother was fired today because of his inept performance, but I received a promotion.
I think it is compound, but I'm not sure if "because of his inept performance" is a dependent clause which would make it a compound/complex sentence.
Thank you.
The above is not a clause because there is no verb in it. It is an adverbial phrase modifying the verb "was fired".
It is a compound sentence joined by the conjunction "but". (My brother was fired today..... but I received a promotion.)
Complex Sentences 
Linear Mode
