Complex sentence: Daniel Nimham (1726--1778) was the last sachem (great chief) of the Nochpeem tribe of the Wappinger and the most prominent Native American of his time in the lower Hudson Valley.
Split into simpler sentences: Daniel Nimham (1726--1778) was the last sachem of the Wappinger. Chief of the Nochpeem band, he was the most prominent Native American of his time in the lower Hudson Valley.