Complex sentence: During the winter of 1869, Lt. H.B. Cushing led his troops into the Guadalupe Mountains and destroyed two Mescalero Apache camps and were eventually driven out of the area and into US reservations.
Split into simpler sentences: During the winter of 1869, Lt. H.B. Cushing led his troops into the Guadalupe Mountains and destroyed two Mescalero Apache camps. They were eventually driven out of the area and into US reservations.