This sentence is a subject-predicate complex sentence. If you want the rainbow to be a conditional adverbial clause, you have to bear the rainbow as the main sentence. If the conditional sentence is subject-predicate-object structure: you is the subject, want is the predicate, and rainbow is the object; The main clause is also a sentence with subject-predicate-object structure: you is the subject, had to up with is the predicate (had to is a modal auxiliary verb, put up with is a phrasal verb), and the rainbow is the object. I wonder if this answer is satisfactory?