Complex sentence: Several years later, Ralph joined White Fang, only to end up losing in the Eve Wars; the next year, he came back into Trowa's life, attempting to buy Heavyarms for the new war that White Fang's remnants planned to start.
Split into simpler sentences: Several years later, Ralph joined White Fang, only to end up losing in the Eve Wars. The next year, he came back into Trowa's life, attempting to buy Heavyarms for the new war that White Fang's remnants planned to start.