Question

这句话是什么句型？

which is made all the more fragile by the fact thatreproduction among these bears has alwaysbeen disappointingly low

Answer 1

句子要完整，局部拿过来，which 是疑问词还是关系代词不好确定，再说有没有标点。
All these influences have a negative impact on the spirit bear's very existence, which is made all the more fragile by the fact that reproduction among these bears has always been disappointingly low.
你给的部分，是一个非限制性定语从句。which代前文所述的整个“灵熊生存受诸多因素影响的情景”
which从句是个被动句。

which (关系代词）做主语，后面是谓语（is made 被动结构）the more fragile 是形容词短语作主语补足语，by the fact 介词短语 （作状语）引出 造成这一情景更加脆弱的一个事实。
the fact 后面that 从句是先行词the fact的同位语从句。