It is an expensive inefficiency made worse, he says, by the fact that recepients have still often had to wait for a failed delivery.

【答】句中有单词拼写错误：recepients 应为recipients （收货人；接货人）；he says 为“插入语”。为了分析方便，可去掉。

It （主语）is （系动词）an expensive inefficiency （表语）made worse by the fact that recepients have still often had to wait for a failed delivery.（过去分词短语作定语）

made worse by the fact，可以转换为定语从句：which is made worse by the fact  “被这个情况弄得更糟”。

在定语部分中，that recepients have still often had to wait for a failed delivery是the fact 的同位语。

【翻译】他说，这是一个代价昂贵的低效率，由于收货人往往一直不得不等待落空的货物交付，让低效率变得更糟。