Simplify the following text for a Grade 8 native English-speaking person.
Original: It abolished the previously existing administrative counties and county boroughs ( but not the previous non-administrative ` counties ' ) and created a new set of 46 ` counties ' in England , 6 of which were metropolitan and 40 of which were non-metropolitan .
Simplified: It created a new set of 46 counties , six of which were metropolitan and 40 of which were non-metropolitan .