What structure is used in this sentence we wont know whom the students chose for cheerleader until monday morning?

The sentence uses a complex structure, combining an independent clause ("we won't know") with a dependent clause ("whom the students chose for cheerleader"). The dependent clause acts as the object of the verb "know," and the sentence overall conveys a future uncertainty regarding the students' choice. The use of "whom" indicates that it is the object of the verb "chose."