Simplify the following text for a Grade 14 native English-speaking person.
Original: When he finally called a national assembly in 1847 , it was not a representative body , but rather a United Diet comprising all the provincial estates , which had the right to grant taxes and loans but no right to meet at regular intervals .
Simplified: When he finally called a national assembly in 1847 , it was not a representative body , but rather a United Diet which cold speak for all the provincial estates and had the right to grant taxes and loans but no right to meet at regular intervals .