Complex sentence: A veteran of the Mexican-American War (1846-48), Jeremiah Johnson seeks refuge in the West, and aims to take up the life of a mountain man, supporting himself in the western mountains as a trapper.
Split into simpler sentences: A veteran of the Mexican-American War (1846-48), Jeremiah Johnson seeks refuge in the West. He aims to take up the life of a mountain man, supporting himself in the western mountains as a trapper.