Complex sentence: John of Saxony or Johannes de Saxonia or John Danko or Dancowe of Saxony was an astronomer who spent most of his active career, from about 1327 to 1355, at the University of Paris.
Split into simpler sentences: John of Saxony or Johannes de Saxonia or John Danko or Dancowe of Saxony was an early medieval astronomer. He spent most of his active career, from about 1327 to 1355, at the University of Paris.