the usps reported a net loss of $5.6 billion for fiscal 2016, the 10th straight year its expenses have exceeded revenue.
(1) 本句骨干规划为the usps 
reported a net loss of $5.6 billion for fiscal 2016，逗号后边的为同位语，对前面的2016进行说明阐明。在这个同位语中包括一个定语从句，即its expenses have exceeded revenue，润饰前面的the 10th straight year。
(2) 本句译文:美国邮政陈述了2016财年56亿美元的净亏本，这是接连第十年它的开支跨越收入。