Thank you! Please, correct me if I'm wrong:
He came to a conclusion that makes me happy (= a noun + a modifier).
He came to the conclusion that the new year would be better (= the noun + a complement).
I'm not sure because Ludwig gives the following examples:
a) This phenomenon might come to an idea that the capability of antiadversity of normal cells is stronger than that of cancer cells when incubated with a relatively high concentration of UCNPs in certain range.
b) Accordingly, we have come to an idea that varying parameters should affect the final cosmetic result of the early treatment.
c) Another one of the goals was to come up with an idea that down the road would do a good job of blending in with a large tree nearby and the insects that stop by outside.