Simplify the following text for a Grade 8 native English-speaking person.
Original: The chief VOC official in Japan was called the Opperhoofd by the Dutch , or Kapitan ( from Portuguese capitÃ # o ) by the Japanese .
Simplified: The most important Dutch official in Dejima was called the Opperhoofd by the Dutch . The Japanese also called him Kapitan ( from Portuguese capitÃ # o ) .