彼の考え方は

his way of thinking is

→ 彼
phrase Rare #38,904
his way of thinking is は marks 彼の考え方 (his way of thinking) as the topic; the sentence continues with a description of it.
JA: 彼の考え方はとても柔軟です。
EN: His way of thinking is very flexible.

彼の考え方は少し極端だ。

His way of thinking is a bit extreme.

彼の考え方は健全です。

His way of thinking is sound.