Complex sentence: The intact lot passed through the hands of several other coin dealers before finally being purchased by Colonel E.H.R. Green (son of the infamous miser Hetty Green), who kept them in his collection until his death in 1936.
Split into simpler sentences: The intact lot passed through the hands of several other coin dealers before finally being purchased by Colonel E.H.R. Green (son of the infamous miser Hetty Green). Green kept them in his collection until his death in 1936.