He【主语】//saw【谓语动词】// more【前置定语】// enthusiasts【宾语】// from other parts of China【后置定语】//, for whom the experience is valuable to be recorded in photos【非限制性定语从句】//.

参考译文:他看到了更多来自中国其它地区的爱好者,对他们来说,这段经历是很有价值的,可以用照片记录下来。

【备注:关系代词whom指代more enthusiasts在定从作介词for宾语,与for 构成介词短语作定从句对象状语。】

非限制性定语从句结构分析如下

for whom【对象状语】//  the experience【主语】//  is 【系动词】// valuable【表语】//  to be recorded in photos【补足语/状语】//.

【1】The experience is valuable to be recorded.=It is valuable (for them省略) that the experience is recorded.

备注:以上句子不定式逻辑主语，没有隐藏在句中中，所以用不定式被动结构表被动含义。

【2】The experience is valuable (for them省略) to record.=It is valuable (for them省略) to record the experience.

备注:以上句子不定式逻辑主语，有隐藏在句子中,所以用不定式主动结构表被动含义。.