My iphone is broken and I don't know what's wrong with it?

First of all the front and back is cracked which I know how but can someone tell me what's wrong with the screen because when I turn it on or go onto an app or something you can see faded black lines in the background which are not suppose to be there. It is an iphone 4s btw. Also it turns off by itself sometimes.
Please could someone tell me what's wrong and how much it costs to fix?My iphone is broken and I don t know whats wrong with it

How you tried doing a firmware restore on intunes

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