he said (that) the text was very difficult and that we had t

he said that the text was very difficutl 宾语从句：他说那篇课文很难
and that we had to work hard at it 与that the text was very difficutl 平行,相当于：
he said that we had to work hard at it
也就是说他说了两个内容：
1.那篇课文很难
2.我们须努力