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Converting to algebraic number and computing its radical expression does the trick here:

s = 7/6528*(103*sqrt(sqrt(17) + 17)*(sqrt(17) - 17) + 252*sqrt(17)*sqrt(-sqrt(17) + 17))/(sqrt(sqrt(17) + 17)*(sqrt(17) - 17)) 
QQbar(s).radical_expression()

Converting expession to an algebraic number and computing its radical expression does the trick here:

s = 7/6528*(103*sqrt(sqrt(17) + 17)*(sqrt(17) - 17) + 252*sqrt(17)*sqrt(-sqrt(17) + 17))/(sqrt(sqrt(17) + 17)*(sqrt(17) - 17)) 
QQbar(s).radical_expression()
print( QQbar(s).radical_expression() )