original passage: Johann Spurzheim was Gall's most important collaborator. He worked as Gall's anatomist until 1813 when for unknown reasons they had a permanent falling out. Publishing under his own name Spurzheim successfully disseminated phrenology throughout the United Kingdom during his lecture tours through 1814 and 1815 and the United States in 1832 where he would eventually die.
original sentence: He worked as Gall's anatomist until 1813 when for unknown reasons they had a permanent falling out.
sentence2: Have any sources available to modern-day historians come from outside sources that could be giving false accounts of what happened between Spurzheim and Gaff?
sentence1: Johann Spurzheim was Gall's most important collaborator. He worked as Gall's anatomist until 1813 when for unknown reasons they had a permanent falling out. Publishing under his own name Spurzheim successfully disseminated phrenology throughout the United Kingdom during his lecture tours through 1814 and 1815 and the United States in 1832 where he would eventually die.