Simplify the following text for a Grade 12 native English-speaking person.
Original: Tezcatlipocas Nagual , his animal counterpart , was the jaguar and his Jaguar aspect was the deity Tepeyollotl `` Mountainheart '' .
Simplified: Tezcatlipoca 's nagual , his animal counterpart , was the jaguar and his jaguar aspect was the deity Tepeyollotl ( `` Mountainheart '' ) .