This is a very old sycamore that has been coppiced over the years. We have taken off all the young shoots and a few older ones to leave enough to shade the bodega pig run behind it, and making a rather comfy wooden GOT type throne for relaxing on.
To lead a tranquil life, mind your own business and work with your hands.
We had our mature (probably around 25 years old) sycamore cut down almost two years ago, and it's trying to do the same as yours. I hated that tree: we have a small garden in a small rural village, and it cast so much shade, but the worst thing was the seedlings. Hundreds of seedlings all over the garden every year, with me trying to hoe them where possible, but mostly having to pull them up one by one. I even had to pull some up this year.
Now it's trying to grow back like a mega hydra: forty heads growing where one was cut off. Still, I guess keeping it coppiced will keep us well stocked in kindling.