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Review: Sentence Structure, Answer 10.4

Oops!

Question:
When the train arrives, and if Ms. Lang is on it, she will be served with a subpoena.
Answer:
The answer compound-complex sentence is not correct.
Explanation:
This is a complex sentence. At first glance, it might look like a compound-complex sentence because of the conjunction and joining the two dependent clauses when the train arrives and if Ms. Lang is on it. However, since there is only one independent clause in the sentence (she will be served with a subpoena), it cannot be compound.