Simplify the following text for a Grade 9 native English-speaking person.
Original: Once common on the east coast , Emu are now uncommon ; by contrast , the development of agriculture and the provision of water for stock in the interior of the continent have increased the range of the Emu in arid regions , and it is neither endangered nor vulnerable .
Simplified: On the mainland of Australia emus were once common on the east coast but have become uncommon with increased human population . On the other hand the development of farms and the supply of water for stock have increased the range of the Emu in arid ( dry ) regions .