Simplify the following text for a Grade 9 native English-speaking person.
Original: The majority of tiger poaching happens in Madhya Pradesh , Uttar Pradesh , Uttarakhand , Orissa , West Bengal , Assam and Arunachal Pradesh .
Simplified: The majority of tiger poaching happen in Madhya Pradesh , Uttar Pradesh , Orissa , West Bengal , Assam and Arunachal Pradesh .