Simplify the following text for a Grade 5 native English-speaking person.
Original: Frederick Coyett , the governor of Taiwan for the company , was stationed in Fort Zeelandia with 1,800 men ; his subordinate Valentyn was in charge of Fort Provintia and its garrison of 500 men .
Simplified: Frederick Coyett , the governor of Taiwan was at Fort Zeelandia with 1,800 men . Fort Provintia had 500 men .