Simplify the following text for a Grade 9 native English-speaking person.
Original: Recent phylogenomic studies have surprisingly shown tinamids as the sister group of Australasian\/Oceanian ratites ( cassowaries , emus , and kiwi ) , with South American ratites ( rheas ) and African ratites ( ostriches ) as successive outgroups .
Simplified: Those are the ( cassowaries , emus , and kiwi ) . South American ratites ( rheas ) and African ratites ( ostriches ) are also related , but more distantly .