Simplify the following text for a Grade 13 native English-speaking person.
Original: A great admirer of the Kadampa ( Bka ' - gdams-pa ) teachings , Tsongkhapa was an enthusiastic promoter of the Kadam School 's emphasis on the mahÄ yÄ na principle of universal compassion as the fundamental spiritual orientation .
Simplified: Tsongkhapa was a big promoter of the Kadampa ( Bka ' - gdams-pa ) teachings and the mahÄ yÄ na principle of universal compassion as the fundamental spiritual orientation .