英语翻译However,that Malthus was wrong about his own period and

However是连接副词,
that Malthus was wrong about his own period and the future 是名词性从句 作主语 是主语从句need not imply是谓语
that he was wrong about the past.是名词性从句作宾语 是宾语从句
然而,关于 他所处的时期 和将来 马尔萨斯是错的 ,这一点 不需表明 他对关于过去也是错的.