Simplify the following text for a Grade 15 native English-speaking person.
Original: Credited with shaping much of Chinese thought , Confucianism was the official philosophy throughout most of Imperial China 's history , and mastery of Confucian texts provided the primary criterion for entry into the imperial bureaucracy .
Simplified: Confucianism was the official philosophy throughout most of Imperial China 's history , and becoming a professional of Confucian texts was needed to be part of the imperial bureaucracy .