Simplify the following text for a Grade 9 native English-speaking person.
Original: In 1580 Sumitada gave the jurisdiction of Nagasaki to the Jesuits , and the Portuguese obtained the de facto monopoly on the silk trade with China through Macau .
Simplified: In 1580 Sumitada gave the jurisdiction of Nagasaki to the Jesuits . The Portuguese became the only ones trading silk with China through Macau .