在经历过不幸和困难后,很少有人还能保持从前的身心健康和活力.
very few是主语,指很少有人.come through 经历.distressful periods是苦难的日子.physical and mental vigor 身体和精神的活力.
Very few can come through distressful periods.本身一个完整的句子,拥有完整的意思.后面的with more physical and mental vigor than they had before.做状语,修饰人的状态.