Complex sentence: In 1928, his heirs sold it to Hamilton Rivers Pollock (1884-1941), a barrister who lived there until his death, after which it was used for the duration of the Second World War as a home for children evacuated from London.
Split into simpler sentences: In 1928, his heirs sold it to Hamilton Rivers Pollock (1884-1941), a barrister who lived there until his death. For the rest of the Second World War, Urchfont Manor was a home for children evacuated from London.