Seeking reason for uncle's purple heart

I have my uncle's discharge papers showing he received his purple heart, (GO 86 HQ 30th Gen Hosp 12 Nov 44) it also shows he received the EAME Campaign Medal with 3 Bronze Stars. I would love to learn what all of this means.  I am working on a presentation for one of my college history classes, any info would be helpful.

Thank you

Loree