Tā zìchēng shānyě zhī rén, bù dǒng guānchǎng de guīju.
He called himself a simple countryman who knew nothing of the ways of officialdom.
Tips
usage
Literary. Besides wild country, 山野 stands for plain people far from power, as against 朝廷 'the court': 山野之人 is a modest way to call oneself a simple countryman.