Conversation so far:
what happened inJames Watt's later years?
James Watt retired in 1800.
Why did James Watt retire in 1800?
It was the same year that James Watt's fundamental patent and partnership with Boulton expired.
What else did James Watt do after he retired when his fundamental patent and partnership with Boulton expired?
James Watt continued to invent other things before and during his semi-retirement.
Did James Watt travel anymore after he retired?
James Watt and his wife travelled to France and Germany, and he purchased an estate in mid-Wales at Doldowlod House, one mile south of Llanwrthwl, which he much improved.

Question: Did they accomplish anything after retirement?
Self-contained rewrite: Did James Watt accomplish anything after retirement?