Sumach (Rhus typhina) - by the looks. Google it for more info.

Stags horn sumach.

It doesn't look big enough to be several hundred years old. Is that just part of an enormous grove of this plant? It produces lots of suckers so could get very wide.

Or the plant could have been cut down/ blown over and regrown.

This happened in a garden we used to have. We lost a big sumach in the hurricane in 1987 or whenever it was. We moved away, but I passed the house a decade or so later - and there was the tree that we thought had gone for ever. :-)

i find its good to put in a lawn as its quite airy and lets plenty of light threw and you just mow down the newsuckerswith the grass . its very tropical looking exotic plant that is quit stunning . i realy like it but i haveknow more room which is typical . the part of the tree wecan see in thephoto is about 30-40 years old id say as itsaquick grower and very hardy .

Probably Sumac. Ailanthus has longer leaves with more leaflets, and more expansive and colorful flower clusters.

Many thanks for all answers from good gardening friends

your welcome gandaco .