帮忙分析一个句子

The prehistoric art of inscribing figures and designs on rock surfaces seems to have slowly disappeared with the
advent of agriculture,which required a large amout of time and energy.

随着需要花费大量时间和精力的农业的出现，古代的那些在石头上刻字和画画的艺术将慢慢的消失（在人们的视线中）。

The prehistoric art of inscribing figures and designs on rock surfaces seems to have slowly disappeared with the
advent of agriculture,which required a large amout of time and energy.


主干部分是 The prehistoric art seems to have disappeared. 后面的with the advent of 是状语表示因果，而后面的which引导的非限制定语从句是修饰农业的。

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[ 本帖最后由 xfchina11 于 2009-9-10 08:14 编辑 ]