As some people evaluated this movie as an impressive and alm

As some people evaluated this movie as an impressive and almost daunting achievement,who said that it seemed more appropriate for grown-ups rather than for kids because of the Shakespearean in tone and epic in scope.
能帮忙分析一下这句的结构吗 这句话结构对吗
比如who是指什么,as引导的那句是什么句,as引导的该类句型该怎么用呢,
还是没太懂~如果as引导时间状语从句，意思也不通啊，而且主句里不是没主语只有who了吗，可以这样吗？如果as是尽管的连词，并列的后一句里也没有确定的主语啊~who可以直接替代主语吗？