We inherited this mystery tree and this lilac bush when we moved into my husband’s childhood home, so I know for a fact that neither has been properly pruned in at least 50 years. It’s pretty ratty - most of the year it looks like a bundle of dead sticks - and it flowers but I assume not as much as it could. How can I rehabilitate this thing, and it’s lilac friend? I know the three-year plan for lilacs, but I’m not sure how weird that would look given that some of the branches are like tree trunks now. Thanks for the ID and for any advice on pruning and care!