The company rewarded him for his years of service with a gold watch.

rewarded 是动词 reward 的过去式，reward 由前缀 re-（表示"回"）和 ward（古英语词根，意为"看护、给予"）组成，本义是"给予回报"，引申为"奖励、报答"的意思。在这里表示公司对他多年服务的回报行为。