Simplify the following text for a Grade 9 native English-speaking person.
Original: The Yellow Sect rose and prospered primarily because of the personal prestige of its founder Tsongkhapa ( Tsong Khapa or Lobsang Drakpa , also known as JÃ RinpochÃ , 1357-1419 ) who is identified as the manifestation of MaÃ jushri , bodhisattva of Wisdom .
Simplified: The Yellow Hat Sect was started by Tsongkhapa ( Tsong Khapa or Lobsang Drakpa , also known as JÃ RinpochÃ , 1357-1419 .