it's difficult to understand
Es difícil entender esta novela.
This novel is difficult to understand.
Para ser honesto, me es difícil entender por qué quieres ir allí.
To be honest, I find it difficult to understand why you want to go there.
Es difícil entender sus ideas.
It’s difficult to understand their ideas.
Me es difícil entender esta pregunta.
I find this question difficult to understand.
Es difícil entender los textos de aquel autor, él utiliza muchas metáforas.
It’s difficult to understand that author’s texts; he uses a lot of metaphors.
Es difícil entender su teoría.
His theory is difficult to understand.