Simplify the following text for a Grade 9 native English-speaking person.
Original: In the Song Dynasty ( 960-1279 ) , the method of making powdered tea from steam-prepared dried tea leaves , and preparing the beverage by whipping the tea powder and hot water together in a bowl became popular .
Simplified: Powdered tea , stored and traded as tea bricks , seems to have been invented in China during the Song Dynasty ( 960-1279 ) .