One of the most serious of the many challenges the Chinese government faces is the loss of arable land.
你把黑体部分提前,便得到:
Of the many challenges the Chinese government faces, one of the most serious is the loss of arable land.
这个最高级常用的格式,把范围定语提到句首,予以强调,同时照顾了句子结构的匀称。