彼の考えを理解するのは難しい。

English Translation

It is hard to understand what he is thinking.

Unnatural a bit although understandable. Here are my alternative translations.

彼の考えは分かりづらい。(かれのかんがえはわかりづらい)

彼の内心は読みづらい。(かれのないしんはよみづらい)= (lit.) It’s hard to read his mind.

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