Complex sentence: On August 27,1835, Kneass suffered a debilitating stroke that left him paralyzed on his right side, when from then on, assistant engraver Christian Gobrecht did all pattern and die work, until Kneass died in office on August 27,1840.
Split into simpler sentences: On August 27,1835, Kneass suffered a debilitating stroke that left him paralyzed on his right side. Once second engraver Christian Gobrecht was hired, he did most all pattern and die work until Kneass died in office on August 27,1840.