Simplify the following text for a Grade 5 native English-speaking person.
Original: Macleans was the first public school in New Zealand to use the Whanau House System - dividing the school up into ` houses ' or ` families ' of about 300 students each , with two classes of 30 or so students for each year level .
Simplified: This is dividing the school up into eight ` houses ' . Each house contains about 300 students in total , with two classes of 30 students in each year .