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.
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。