Final answer:
The dependent clause in the sentence is 'which he planned to give to his friends.' It relies on an independent clause to complete its meaning.
Step-by-step explanation:
The dependent clause in the sentence is 'which he planned to give to his friends.' A dependent clause is a group of words that contains a subject and a predicate but cannot stand alone as a complete sentence. It relies on an independent clause to complete its meaning. In this case, the independent clause is 'D.J. Moore folded a bunch of origami swans' and the dependent clause is 'which he planned to give to his friends.'
Learn more about dependent clauses in English language