彼(かの)女(じょ) kanojoを o喜(よろこ)ば()せ() yorokobaseたかった takattaので node、素(す)敵(てき)な() sutekinaプレゼント purezentoを o買(か)っ()た() katta。 I wanted to make her happy, so I bought her a nice present. Literal Her please wanted [because-ので], nice present [object-を] bought. 喜ばせたかったので — the causative ~させる plus ~たい ('want to') plus ~ので ('because'). A layered expression of motivation. romanceshopping~たい (want to)~ので (because)causative form (~せる/~させる)
彼(かの)女(じょ) kanojoを o喜(よろこ)ば()せ() yorokobaseたかった takattaので node、素(す)敵(てき)な() sutekinaプレゼント purezentoを o買(か)っ()た() katta。 I wanted to make her happy, so I bought her a nice present. Literal Her please wanted [because-ので], nice present [object-を] bought. 喜ばせたかったので — the causative ~させる plus ~たい ('want to') plus ~ので ('because'). A layered expression of motivation. romanceshopping~たい (want to)~ので (because)causative form (~せる/~させる)