Complex sentence: He won the World Boxing Council Light Heavyweight crown in October 1974 by defeating Jorge Ahumada and held the title until 1977 when he was stripped for not going through with a mandated defence.
Split into simpler sentences: He won the World Boxing Council Light Heavyweight crown in October 1974 by defeating Jorge Ahumada. He held the title until 1977 when he was stripped for not going through with a mandated defence.