Simplify the following text for a Grade 11 native English-speaking person.
Original: The continuum hypothesis , which tries to ascertain the relative cardinality of certain infinite sets , was eventually shown to be undecidable ( or independent ) from the generally accepted set of axioms of set theory .
Simplified: The continuum hypothesis , which says something about some properties of certain infinite sets is such an example . It was shown to be undecidable ( or independent ) from the generally accepted set of axioms of set theory .