“单纯的政治家”可以翻译为 "a simple/uncomplicated politician" 或 "a politician with pure motives"（若强调动机纯粹），具体取决于语境侧重：
1、 "a simple politician"
（侧重“单纯、不复杂”，指行事风格或个人特质）
2、 "an uncomplicated politician"
（更正式的表达，强调“没有复杂动机或手段”）
3、 "a politician with pure motives"
（若需强调动机纯粹，无隐秘利益）
示例句子：He is often seen as a simple politician, focused solely on public welfare.
（他常被视为单纯的政治家，只关注公共福利。）
Some critics call him an uncomplicated politician in a field full of intrigue.
（一些批评者称他为政坛中少有的单纯政治家。）
根据语境选择最贴切的翻译即可。