seem easy, look simple
この問題は一見簡単そうだが実は難しい。
This problem looks easy at first glance, but it’s actually difficult.
簡単そうだったもん。
It seemed easy.
簡単そうね。
It seems easy.
簡単そうに見えるけど、結構体力消耗するなぁ。
It looks easy, but it really wears you out.
自己表現は、簡単そうで意外と難しいと思います。
I think self-expression is surprisingly difficult, even though it seems easy.