Simplify the following text for a Grade 8 native English-speaking person.
Original: Trade routes extended across Tanzania into modern day Democratic Republic of the Congo , along which goods were brought to the coasts and were sold to Arab , Indian , and Portuguese traders and even reached as far as China and India .
Simplified: Trade routes extended across Tanzania into modern day Zaire . Along these goods were brought to the coasts and were sold to Arab , Indian , and Portuguese traders and even reached as far as China and India .