It is not a correctly written sentence. The police questioned everyone here, and they held poor Alejandro for two days, probably guessing his vulnerability. That is a compound sentence.
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KozmolIs the following a compound-complex sentence?If you are studying a method of analysis that calls "guessing his vulnerability" a participle clause (and therefore a subordinate clause), then yes, it's compound-complex because it has two independent clauses and a dependent (subordinate) clause.