Simplify the following text for a Grade 7 native English-speaking person.
Original: Whilst radicals such as Sir Francis Burdett believed that Magna Carta could not be repealed , the 19th century would see the beginning of the repeal of many of the clauses of Magna Carta . The clauses were either obsolete and\/or had been replaced by later legislation .
Simplified: Only three of the original clauses in Magna Carta are still law today .