Simplify the following text for a Grade 8 native English-speaking person.
Original: The multituberculates had a cranial and dental anatomy similar to rodents with cheek-teeth separated from the chisel-like front teeth by a wide tooth-less gap ( the diasteme ) .
Simplified: The multituberculates had a head anatomy similar to rodents . They had cheek-teeth separated from the chisel-like front teeth by a wide tooth-less gap ( called the diastema ) .