Complex sentence: Among Geronimo's own Chiricahua tribe many had mixed feelings about him--while respected as a skilled and effective leader of raids or warfare, he emerges as not very likable, and he was not widely popular among the other Apache.
Split into simpler sentences: Among Geronimo's own Chiricahua tribe many had mixed feelings about him. While respected as a skilled and effective leader of raids or warfare, he emerges as not very likable, and he was not widely popular among the other Apache.