When the world, which was created in beauty, becomes ugly and disorderly, the Navajo gather to perform rituals with songs and make sand paintings to restore beauty and harmony to the world.

　　结构分析：

　　when引导的时间状语从句，其中含有定语从句作插入语，之后才出现主句。

　　句子分析：

　　When the world, which was created in beauty, becomes ugly and disorderly

　　时间状语从句中，the world 作主语，后接which引导的定语从句，which指代the world, which引导的从句中was created 作谓语，in beauty 状语。 becomes ugly and disorderly 是when引导的状语从句里的系表结构作谓语部分。本部分的意思是：当在美丽中创造的世界变的丑陋和无序。

　　the Navajo gather to perform rituals with songs and make sand paintings to restore beauty and harmony to the world.

　　主句终于上线，其中the Navajo 主语，gather......... and make是并列动词作谓语。to perform rituals with songs, 目的状语。

　　make sand painting，中sand painting作宾语。to restore beauty and harmony to the world,不定式作状语。本部分的意思：纳瓦霍人聚集起来用歌曲举行仪式，并且用沙画恢复世界的美丽与和谐。

　　参考翻译：

　　当在美丽中创造的世界变的丑陋和无序，纳瓦霍人聚集起来用歌曲举行仪式，并且用沙画恢复世界的美丽与和谐。