Potentially dying trees in our front yard
These trees are 23 years old. Two years ago we had them trimmed to take off lower branches and to allow more height. This year we noticed that many branches appear to be dead, with no leaves on them at all. There is also this proliferie of leaves and growth in the middle of the tree(see picture). The trees lack the fullness they had last year. We want to try to get help for them before it's too late.
We are sorry to say, but judging from your photos, it looks like your tree is beyond help and is ready to be removed.
If it is an ash as it appears, this is not surprising given that the Emerald Ash Borer has now been found throughout the western shore of Maryland. This is an invasive pest that has the potential to kill all the ash trees in our area.
Here is our page about them: http://www.extension.umd.edu/hgic/invasives/emerald-ash-borer
Here too is our page about how to decide when to remove a tree: https://extension.umd.edu/learn/how-do-you-decide-when-remove-tree
If it's fall were to threaten people or property, remove the sooner rather than later. If not, a large portion could be left for wildlife habitat, which is referred to as a 'snag'. Many birds, mammals, etc. could use it.