Complex sentence: Oscar Hernández (nicknamed "Martillo", hammer in English) is a retired Honduran football forward, who played most of his senior career for C.D. Motagua in the Honduran league.
Split into simpler sentences: Oscar Hernández (nicknamed "Martillo", hammer in English) is a retired Honduran football forward. He played most of his senior career for C.D. Motagua in the Honduran league.