Complex sentence: Early white explorers reported the Sinixt to be of average height and size, with hazel eyes, adept in making suspended bridges over the narrow, swift-flowing Columbia, and skillful at fishing.
Split into simpler sentences: Early white explorers reported the Sinixt to be of average height and size, with hazel eyes. They were adept in making suspended bridges over the narrow, swift-flowing Columbia, and skillful at fishing.