Complex sentence: The British frequently classified the peoples that they conquered with fixed personality or "racial" traits and regarded both the Punjabi Sikhs and the Pashtun Afridi tribesmen as "warlike" peoples.
Split into simpler sentences: The British frequently classified the peoples that they conquered with fixed personality or "racial" traits. They regarded both the Punjabi Sikhs and the Pashtun Afridi tribesmen as "warlike" peoples.