Subject = reason Verb = was Nominative complement = I could use it
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park sang joonI'd dearly love to know whether the "so" clause expressing "purpose" is the complement of "was."The second reason I needed to own it was [so (that) I, as an aspiring artist, could use it as a reference].
park sang joonI'd also like to know whether I can use the clauses like "in order that~" and "that + an auxiliary verb" as a complement.You can use a content clause as complement to be, yes:
park sang joon I am here that I can help you with homework.No, content clauses aren’t used adverbially like that. You need to include so. And even with the reason you need so to show purpose: