Please help me with the sentence: should the 'and' between ' by the Nazis' and ' may also' be 'it'? 下面这个句子的结构我不理解。When capitalized Holocaust refers specifically to the destruction of Jews and other Europeans by the Nazis and may also encompass the Nazi persecution of Jews that preceded the outbreak of the war. 按照我的理解（应该是错的吧），When引起的这句话只有从句，没有主句，是不应该的——这就是我的疑问。我的理解：When capitalized Holocaust refers specifically to the destruction of Jews and other Europeans by the Nazis-----------（到这里为止，这是个从句，从后文看，不是主语从句，那么就应该是定语从句或状语从句） ；and may also encompass the Nazi persecution of Jews that preceded the outbreak of the war.------------（and may... 显然省略了句子的主语，那么主语是什么？从意思看，应该是 the capitalized Holocaust, 那么and (the capitalized Holocaust) may also encompass...是与（capitalized Holocaust） refers....并列的成分了，即由when 引起的两个并列句作从句（或者说两个由when引起的从句），那么主句是什么？这个句子只有从句，没有主句了。这就是矛盾所在，我求解的就是这个问题。