第一句话不太明白你要说什么. 是要说：”文学小说中,主角的命运是由多种方面决定的,比如作者的意向和读者的需求.“ 吗?
第二句话：
Nancy had complex character which caused her death destiny have three reasons in this novel.
应该是：
In this novel, the background setting of Nancy's complex character which caused her death have three reasons. 在这部小说中,把南希设定为性格负责的角色,有3个理由. 而正是这种设定导致了南希的死亡.