Chinese news portal Huanqiu.com reported that a witness saw a man in the corridor at around the time Jiang was attacked.
我觉得从句中有两个谓语 saw 和was 我觉得正确的应该是：a witness saw a man in the corridor at around the time Jiang be attacked. (See sb do sth ) 求指导啊

这又是个从句
这saw后面是一个从句，整个从句做saw的宾语，是宾语从句。所以是正确的。