Simplify the following text for a Grade 10 native English-speaking person.
Original: Buchanan believes that a constitution , intended for use by at least several generations of citizens , must be able to adjust itself for pragmatic economic decisions and to balance interests of the state and society against those of individuals and their constitutional rights to personal freedom and private happiness .
Simplified: Buchanan believes that every constitution is created for at least several generations of citizens . Therefore , it must be able to balance interests of the state , society , and each individual .