Verified Answer :

It's not a simple sentence: it has more than one clause.

It is also not compound: the two clauses are not independent and a compound has independent clauses.

It is however complex: the two clauses are not independent (While you were on vacation is the dependent clause). This is the correct answer.

(it's not compound-complex because it has 2 and not more clauses)

Answer:

this is a complex sentence

Explanation:

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