父(ちち) chichiは wa古(こ)代(だい)史(し) kodaishiに ni関(かん)心(しん)を()持(も)っ()て()い()る() kanshinwomotteiru。 My father is interested in ancient history. Literal Father [topic-は] ancient-history [to-に] interest [object-を] having. 関心を持っている means 'to have interest in' — に marks the object of interest. 古代史 (ancient history) is a Sino-Japanese compound. familyhistoryhobbies~ている (ongoing state)
父(ちち) chichiは wa古(こ)代(だい)史(し) kodaishiに ni関(かん)心(しん)を()持(も)っ()て()い()る() kanshinwomotteiru。 My father is interested in ancient history. Literal Father [topic-は] ancient-history [to-に] interest [object-を] having. 関心を持っている means 'to have interest in' — に marks the object of interest. 古代史 (ancient history) is a Sino-Japanese compound. familyhistoryhobbies~ている (ongoing state)