To realize how great was the dramatic activity,/we must remember further that hosts of plays have been lost,/and that probably there is no author of note whose entire work has survived.

　　断句：原则：长度适中

　　方法：寻标志，断长句

　　标点：标点：逗号

　　成分分析：

　　主干：we must remember that plays have been lost and that probably there is no author

　　修饰：To realize how great was the dramatic activity 目的状语，修饰we前半句

　　further 状语，修饰动词remember

　　hosts of 定语，修饰名词plays

　　of note 定语，修饰名词author

　　whose entire work has survived 定语，修饰名词author

　　翻译：

　　为了认识到戏剧艺术有多么的伟大,我们必须还要记住,大量的戏剧已经不复存在,而目也许没有任何一个著名作家的全部作品都能够幸存下来。

　　在翻译长难句时，首先断句，在分析句子成分，句内调整，句间调整，最后组成句子。