Complex sentence: The mistake was noticed in 1832 when German Professor of zoology Johann Wagler realized that the 1819 specimen collected by Spix was smaller and a different color than the Hyacinth Macaw and he designated the new species as "Sittace spixii".
Split into simpler sentences: The mistake was corrected in 1832 when German Professor of zoology Johann Wagler realized that the 1819 specimen collected by Spix was smaller and a different color than the Hyacinth Macaw. He designated the new species as "Sittace spixii".