Complex sentence: In 2011, he was bond to the symbioses and became Agent Venom after lose both his leg from the war.Which later he become a superhero which he was the first to control the symbiosis.
Split into simpler sentences: In 2011, he was bound to the symbioses and became Agent Venom after losing both of his legs in the war. He would later become a superhero, as he is the first to control the symbiosis.