Simplify the following text for a Grade 10 native English-speaking person.
Original: There , from 1950 onward , he taught top management how to improve design ( and thus service ) , product quality , testing and sales ( the last through global markets ) through various methods , including the application of statistical methods .
Simplified: There , from 1950 onward he taught top management how to improve design , product quality , testing and sales , by using several methods .