Imported Mesh Mess

Hello Forum, I hope everyones well during lockdown :+1:. I have an issue, I have downloaded a model from a suppliers online catalogue, a piece of furniture, 3ds format. Imported into my Rhino model, itโ€™s a mess, looks terrible, feels clunky etc etc. Question, is there a way/method to clean this up, optimise it, make it more friendly to use etc etc ? screenshot and file attached, tia :grin:
Imported Mesh Mess.3dm (6.7 MB)