Complex sentence: The charts included and its authoring raised great controversy among scholars, particularly a world map enclosed to the Pacific Ocean, which has been interpreted as an attempt to dissuade the circumnavigation that Magellan then prepared in Seville, in the court of Charles I of Spain.
Split into simpler sentences: The charts included and its authoring raised great controversy among scholars. Particularly a world map enclosed to the Pacific Ocean, which has been interpreted as an attempt to dissuade the circumnavigation that Magellan then prepared in Seville, in the court of Charles I of Spain.