Simplify the following text for a Grade 9 native English-speaking person.
Original: David 's lab was filled with people , such as Dan Stinchcomb ( who introduced Mello to the practice of molecular biology ) , who would prove to be important in Mello 's future training .
Simplified: Davids lab was filled with people , such as Dan Stinchcomb , who taught Professor Mello about molecular biology . These people were important to train Professor Mello for the future .