Simplify the following text for a Grade 15 native English-speaking person.
Original: But after an uprising of the predominantly Christian population in the Shimabara-Amakusa region the Tokugawa government decided to expel all Western nationals except the Dutch employees of the Dutch East India Company ( Vereenigde Oostindische Compagnie , VOC ) .
Simplified: After a rebellion of the mostly Christian population in the Shimabara-Amakusa region , the Tokugawa government banned all Western nationals except the Dutch employees of the Dutch East India Company ( Vereenigde Oostindische Compagnie , VOC ) .