Complex sentence: The nephew who inherited the estate after Mary Clark Thompson's death in 1923, sold the property to the Federal Government in 1931, which built a veteran's hospital (today the Canandaigua VA Medical Center) on the adjacent farmland.
Split into simpler sentences: The nephew who inherited the estate after Mary Clark Thompson's death in 1923 sold the property to the Federal Government in 1931. They then built a veteran's hospital (today the Canandaigua VA Medical Center) on the adjacent farmland.