We are assuming all photos are from the same tree.
Is this tree a type of apple or crabapple?
We think the leaf spots look like a type of rust disease, perhaps cedar apple rust.
Rusts are unusual in that they need two different host plants to complete their life cycle. Here is our page about them: http://www.extension.umd.edu/hgic/rust-diseases-trees-and-shrubs (when they say 'pomaceous', they mean apple).

If your photo is showing the main trunk (trunks?) of the tree, things do not look promising.  The sloughing bark indicated a failing tree. Trees need their bark to send nutrients/water to the canopy. Without it they can't live.

Here is our page that can help you decide when to it may be time to remove a failing tree. Take a look: https://extension.umd.edu/learn/how-do-you-decide-when-remove-tree

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